diff --git a/benchmarks/benchmark-http2.js b/benchmarks/benchmark-http2.js
index 8d9716d4b59..812fcea2e87 100644
--- a/benchmarks/benchmark-http2.js
+++ b/benchmarks/benchmark-http2.js
@@ -1,12 +1,12 @@
 'use strict'
 
-const { connect } = require('http2')
-const { createSecureContext } = require('tls')
-const os = require('os')
-const path = require('path')
-const { readFileSync } = require('fs')
-const { Writable } = require('stream')
-const { isMainThread } = require('worker_threads')
+const { connect } = require('node:http2')
+const { createSecureContext } = require('node:tls')
+const os = require('node:os')
+const path = require('node:path')
+const { readFileSync } = require('node:fs')
+const { Writable } = require('node:stream')
+const { isMainThread } = require('node:worker_threads')
 
 const { Pool, Client, fetch, Agent, setGlobalDispatcher } = require('..')
 
diff --git a/benchmarks/benchmark-https.js b/benchmarks/benchmark-https.js
index 644f019c37d..2f662bfbb54 100644
--- a/benchmarks/benchmark-https.js
+++ b/benchmarks/benchmark-https.js
@@ -1,11 +1,11 @@
 'use strict'
 
-const https = require('https')
-const os = require('os')
-const path = require('path')
-const { readFileSync } = require('fs')
-const { Writable } = require('stream')
-const { isMainThread } = require('worker_threads')
+const https = require('node:https')
+const os = require('node:os')
+const path = require('node:path')
+const { readFileSync } = require('node:fs')
+const { Writable } = require('node:stream')
+const { isMainThread } = require('node:worker_threads')
 
 const { Pool, Client, fetch, Agent, setGlobalDispatcher } = require('..')
 
diff --git a/benchmarks/benchmark.js b/benchmarks/benchmark.js
index 77b814c98e3..32b761a8a56 100644
--- a/benchmarks/benchmark.js
+++ b/benchmarks/benchmark.js
@@ -1,10 +1,10 @@
 'use strict'
 
-const http = require('http')
-const os = require('os')
-const path = require('path')
-const { Writable } = require('stream')
-const { isMainThread } = require('worker_threads')
+const http = require('node:http')
+const os = require('node:os')
+const path = require('node:path')
+const { Writable } = require('node:stream')
+const { isMainThread } = require('node:worker_threads')
 
 const { Pool, Client, fetch, Agent, setGlobalDispatcher } = require('..')
 
@@ -12,7 +12,7 @@ let nodeFetch
 const axios = require('axios')
 let got
 
-const util = require('util')
+const util = require('node:util')
 const _request = require('request')
 const request = util.promisify(_request)
 
diff --git a/benchmarks/server-http2.js b/benchmarks/server-http2.js
index 0be99cd2fd7..f8183b2fa1a 100644
--- a/benchmarks/server-http2.js
+++ b/benchmarks/server-http2.js
@@ -1,10 +1,10 @@
 'use strict'
 
-const { unlinkSync, readFileSync } = require('fs')
-const { createSecureServer } = require('http2')
-const os = require('os')
-const path = require('path')
-const cluster = require('cluster')
+const { unlinkSync, readFileSync } = require('node:fs')
+const { createSecureServer } = require('node:http2')
+const os = require('node:os')
+const path = require('node:path')
+const cluster = require('node:cluster')
 
 const key = readFileSync(path.join(__dirname, '..', 'test', 'fixtures', 'key.pem'), 'utf8')
 const cert = readFileSync(path.join(__dirname, '..', 'test', 'fixtures', 'cert.pem'), 'utf8')
diff --git a/benchmarks/server-https.js b/benchmarks/server-https.js
index f0275d9cbcc..350ec2e3328 100644
--- a/benchmarks/server-https.js
+++ b/benchmarks/server-https.js
@@ -1,10 +1,10 @@
 'use strict'
 
-const { unlinkSync, readFileSync } = require('fs')
-const { createServer } = require('https')
-const os = require('os')
-const path = require('path')
-const cluster = require('cluster')
+const { unlinkSync, readFileSync } = require('node:fs')
+const { createServer } = require('node:https')
+const os = require('node:os')
+const path = require('node:path')
+const cluster = require('node:cluster')
 
 const key = readFileSync(path.join(__dirname, '..', 'test', 'fixtures', 'key.pem'), 'utf8')
 const cert = readFileSync(path.join(__dirname, '..', 'test', 'fixtures', 'cert.pem'), 'utf8')
diff --git a/benchmarks/server.js b/benchmarks/server.js
index e1a32e838e9..b6aaa8df52e 100644
--- a/benchmarks/server.js
+++ b/benchmarks/server.js
@@ -1,10 +1,10 @@
 'use strict'
 
-const { unlinkSync } = require('fs')
-const { createServer } = require('http')
-const os = require('os')
-const path = require('path')
-const cluster = require('cluster')
+const { unlinkSync } = require('node:fs')
+const { createServer } = require('node:http')
+const os = require('node:os')
+const path = require('node:path')
+const cluster = require('node:cluster')
 
 const socketPath = path.join(os.tmpdir(), 'undici.sock')
 
diff --git a/benchmarks/wait.js b/benchmarks/wait.js
index 771f9f2626c..95b9377021c 100644
--- a/benchmarks/wait.js
+++ b/benchmarks/wait.js
@@ -1,7 +1,7 @@
 'use strict'
 
-const os = require('os')
-const path = require('path')
+const os = require('node:os')
+const path = require('node:path')
 const waitOn = require('wait-on')
 
 const socketPath = path.join(os.tmpdir(), 'undici.sock')
diff --git a/build/wasm.js b/build/wasm.js
index 1104cfec0b0..3fb8f103117 100644
--- a/build/wasm.js
+++ b/build/wasm.js
@@ -1,8 +1,8 @@
 'use strict'
 
-const { execSync } = require('child_process')
-const { writeFileSync, readFileSync } = require('fs')
-const { join, resolve, basename } = require('path')
+const { execSync } = require('node:child_process')
+const { writeFileSync, readFileSync } = require('node:fs')
+const { join, resolve, basename } = require('node:path')
 
 const ROOT = resolve(__dirname, '../')
 const WASM_SRC = resolve(__dirname, '../deps/llhttp')
diff --git a/docs/best-practices/client-certificate.md b/docs/best-practices/client-certificate.md
index 4fc84ece50d..9ead733af9e 100644
--- a/docs/best-practices/client-certificate.md
+++ b/docs/best-practices/client-certificate.md
@@ -11,9 +11,9 @@ The server option `rejectUnauthorized: false` allows us to handle any invalid ce
 ### Client Certificate Authentication
 
 ```js
-const { readFileSync } = require('fs')
-const { join } = require('path')
-const { createServer } = require('https')
+const { readFileSync } = require('node:fs')
+const { join } = require('node:path')
+const { createServer } = require('node:https')
 const { Client } = require('undici')
 
 const serverOptions = {
diff --git a/examples/README.md b/examples/README.md
index 60965c2898a..b175b9daed7 100644
--- a/examples/README.md
+++ b/examples/README.md
@@ -49,7 +49,7 @@ async function postJSONRequest (port = 3001) {
 const { request } = require('undici')
 async function postFormRequest (port = 3001) {
   // Make a URL-encoded form POST request:
-  const qs = require('querystring')
+  const qs = require('node:querystring')
 
   const requestBody = {
     hello: 'URL Encoded Example body'
diff --git a/examples/ca-fingerprint/index.js b/examples/ca-fingerprint/index.js
index 792c08c64b1..7fa6a5ac0fa 100644
--- a/examples/ca-fingerprint/index.js
+++ b/examples/ca-fingerprint/index.js
@@ -1,7 +1,7 @@
 'use strict'
 
-const crypto = require('crypto')
-const https = require('https')
+const crypto = require('node:crypto')
+const https = require('node:https')
 const { Client, buildConnector } = require('../..')
 const pem = require('https-pem')
 
diff --git a/examples/eventsource.js b/examples/eventsource.js
index a9cb323dc86..ca280cb4129 100644
--- a/examples/eventsource.js
+++ b/examples/eventsource.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const { randomBytes } = require('crypto')
+const { randomBytes } = require('node:crypto')
 const { EventSource } = require('../')
 
 async function main () {
diff --git a/examples/proxy/index.js b/examples/proxy/index.js
index 4cf8bc61b16..16aeaeeaba3 100644
--- a/examples/proxy/index.js
+++ b/examples/proxy/index.js
@@ -1,5 +1,5 @@
 const { Pool, Client } = require('../../')
-const http = require('http')
+const http = require('node:http')
 const proxy = require('./proxy')
 
 const pool = new Pool('http://localhost:4001', {
diff --git a/examples/proxy/proxy.js b/examples/proxy/proxy.js
index bb9fcc43418..6c16a5e70b0 100644
--- a/examples/proxy/proxy.js
+++ b/examples/proxy/proxy.js
@@ -1,5 +1,5 @@
-const net = require('net')
-const { pipeline } = require('stream')
+const net = require('node:net')
+const { pipeline } = require('node:stream')
 const createError = require('http-errors')
 
 module.exports = async function proxy (ctx, client) {
diff --git a/examples/proxy/websocket.js b/examples/proxy/websocket.js
index 324d0531c57..f21cafdc838 100644
--- a/examples/proxy/websocket.js
+++ b/examples/proxy/websocket.js
@@ -1,5 +1,5 @@
 const { Pool, Client } = require('../../')
-const http = require('http')
+const http = require('node:http')
 const proxy = require('./proxy')
 const WebSocket = require('ws')
 
diff --git a/examples/request.js b/examples/request.js
index 01dcf58b03b..aa3a86e849e 100644
--- a/examples/request.js
+++ b/examples/request.js
@@ -41,7 +41,7 @@ async function postJSONRequest (port = 3001) {
 
 async function postFormRequest (port = 3001) {
   // Make a URL-encoded form POST request:
-  const qs = require('querystring')
+  const qs = require('node:querystring')
 
   const requestBody = {
     hello: 'URL Encoded Example body'
diff --git a/lib/api/api-connect.js b/lib/api/api-connect.js
index fd2b6ad97a5..9a144fb62ba 100644
--- a/lib/api/api-connect.js
+++ b/lib/api/api-connect.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const { AsyncResource } = require('async_hooks')
+const { AsyncResource } = require('node:async_hooks')
 const { InvalidArgumentError, RequestAbortedError, SocketError } = require('../core/errors')
 const util = require('../core/util')
 const { addSignal, removeSignal } = require('./abort-signal')
diff --git a/lib/api/api-pipeline.js b/lib/api/api-pipeline.js
index af4a1803b44..7b48e952b12 100644
--- a/lib/api/api-pipeline.js
+++ b/lib/api/api-pipeline.js
@@ -4,16 +4,16 @@ const {
   Readable,
   Duplex,
   PassThrough
-} = require('stream')
+} = require('node:stream')
 const {
   InvalidArgumentError,
   InvalidReturnValueError,
   RequestAbortedError
 } = require('../core/errors')
 const util = require('../core/util')
-const { AsyncResource } = require('async_hooks')
+const { AsyncResource } = require('node:async_hooks')
 const { addSignal, removeSignal } = require('./abort-signal')
-const assert = require('assert')
+const assert = require('node:assert')
 
 const kResume = Symbol('resume')
 
diff --git a/lib/api/api-request.js b/lib/api/api-request.js
index d4281ce2449..39aa4c32cce 100644
--- a/lib/api/api-request.js
+++ b/lib/api/api-request.js
@@ -7,7 +7,7 @@ const {
 } = require('../core/errors')
 const util = require('../core/util')
 const { getResolveErrorBodyCallback } = require('./util')
-const { AsyncResource } = require('async_hooks')
+const { AsyncResource } = require('node:async_hooks')
 const { addSignal, removeSignal } = require('./abort-signal')
 
 class RequestHandler extends AsyncResource {
diff --git a/lib/api/api-stream.js b/lib/api/api-stream.js
index c571a6f79a7..58c74188420 100644
--- a/lib/api/api-stream.js
+++ b/lib/api/api-stream.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const { finished, PassThrough } = require('stream')
+const { finished, PassThrough } = require('node:stream')
 const {
   InvalidArgumentError,
   InvalidReturnValueError,
@@ -8,7 +8,7 @@ const {
 } = require('../core/errors')
 const util = require('../core/util')
 const { getResolveErrorBodyCallback } = require('./util')
-const { AsyncResource } = require('async_hooks')
+const { AsyncResource } = require('node:async_hooks')
 const { addSignal, removeSignal } = require('./abort-signal')
 
 class StreamHandler extends AsyncResource {
diff --git a/lib/api/api-upgrade.js b/lib/api/api-upgrade.js
index ef783e82975..52767a36e4a 100644
--- a/lib/api/api-upgrade.js
+++ b/lib/api/api-upgrade.js
@@ -1,10 +1,10 @@
 'use strict'
 
 const { InvalidArgumentError, RequestAbortedError, SocketError } = require('../core/errors')
-const { AsyncResource } = require('async_hooks')
+const { AsyncResource } = require('node:async_hooks')
 const util = require('../core/util')
 const { addSignal, removeSignal } = require('./abort-signal')
-const assert = require('assert')
+const assert = require('node:assert')
 
 class UpgradeHandler extends AsyncResource {
   constructor (opts, callback) {
diff --git a/lib/api/readable.js b/lib/api/readable.js
index cd4811591a7..25b40c109c0 100644
--- a/lib/api/readable.js
+++ b/lib/api/readable.js
@@ -2,8 +2,8 @@
 
 'use strict'
 
-const assert = require('assert')
-const { Readable } = require('stream')
+const assert = require('node:assert')
+const { Readable } = require('node:stream')
 const { RequestAbortedError, NotSupportedError, InvalidArgumentError, AbortError } = require('../core/errors')
 const util = require('../core/util')
 const { ReadableStreamFrom } = require('../core/util')
diff --git a/lib/api/util.js b/lib/api/util.js
index bffd70279a4..60f001b2254 100644
--- a/lib/api/util.js
+++ b/lib/api/util.js
@@ -1,4 +1,4 @@
-const assert = require('assert')
+const assert = require('node:assert')
 const {
   ResponseStatusCodeError
 } = require('../core/errors')
diff --git a/lib/cache/cache.js b/lib/cache/cache.js
index a36ed6c23ae..d49393d15bc 100644
--- a/lib/cache/cache.js
+++ b/lib/cache/cache.js
@@ -9,7 +9,7 @@ const { Request, fromInnerRequest } = require('../fetch/request')
 const { kState } = require('../fetch/symbols')
 const { fetching } = require('../fetch/index')
 const { urlIsHttpHttpsScheme, createDeferredPromise, readAllBytes } = require('../fetch/util')
-const assert = require('assert')
+const assert = require('node:assert')
 const { getGlobalDispatcher } = require('../global')
 
 /**
diff --git a/lib/cache/util.js b/lib/cache/util.js
index 44d52b789ed..eba8a60efa3 100644
--- a/lib/cache/util.js
+++ b/lib/cache/util.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const assert = require('assert')
+const assert = require('node:assert')
 const { URLSerializer } = require('../fetch/dataURL')
 const { isValidHeaderName } = require('../fetch/util')
 
diff --git a/lib/client.js b/lib/client.js
index a46a1504b54..b753df0d906 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -4,10 +4,10 @@
 
 /* global WebAssembly */
 
-const assert = require('assert')
-const net = require('net')
-const http = require('http')
-const { pipeline } = require('stream')
+const assert = require('node:assert')
+const net = require('node:net')
+const http = require('node:http')
+const { pipeline } = require('node:stream')
 const util = require('./core/util')
 const { channels } = require('./core/diagnostics')
 const timers = require('./timers')
@@ -84,7 +84,7 @@ const {
 /** @type {import('http2')} */
 let http2
 try {
-  http2 = require('http2')
+  http2 = require('node:http2')
 } catch {
   // @ts-ignore
   http2 = { constants: {} }
diff --git a/lib/cookies/parse.js b/lib/cookies/parse.js
index aae2750360b..8d60d1cb69b 100644
--- a/lib/cookies/parse.js
+++ b/lib/cookies/parse.js
@@ -3,7 +3,7 @@
 const { maxNameValuePairSize, maxAttributeValueSize } = require('./constants')
 const { isCTLExcludingHtab } = require('./util')
 const { collectASequenceOfCodePointsFast } = require('../fetch/dataURL')
-const assert = require('assert')
+const assert = require('node:assert')
 
 /**
  * @description Parses the field-value attributes of a set-cookie header string.
diff --git a/lib/cookies/util.js b/lib/cookies/util.js
index 2290329fe8e..203c4bcf37c 100644
--- a/lib/cookies/util.js
+++ b/lib/cookies/util.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const assert = require('assert')
+const assert = require('node:assert')
 const { kHeadersList } = require('../core/symbols')
 
 function isCTLExcludingHtab (value) {
diff --git a/lib/core/connect.js b/lib/core/connect.js
index 2d2521dcfbd..94b629493de 100644
--- a/lib/core/connect.js
+++ b/lib/core/connect.js
@@ -1,7 +1,7 @@
 'use strict'
 
-const net = require('net')
-const assert = require('assert')
+const net = require('node:net')
+const assert = require('node:assert')
 const util = require('./util')
 const { InvalidArgumentError, ConnectTimeoutError } = require('./errors')
 
@@ -86,7 +86,7 @@ function buildConnector ({ allowH2, maxCachedSessions, socketPath, timeout, ...o
     let socket
     if (protocol === 'https:') {
       if (!tls) {
-        tls = require('tls')
+        tls = require('node:tls')
       }
       servername = servername || options.servername || util.getServerName(host) || null
 
diff --git a/lib/core/diagnostics.js b/lib/core/diagnostics.js
index e76f73a8c3a..e1af3db6112 100644
--- a/lib/core/diagnostics.js
+++ b/lib/core/diagnostics.js
@@ -1,6 +1,6 @@
 'use strict'
-const diagnosticsChannel = require('diagnostics_channel')
-const util = require('util')
+const diagnosticsChannel = require('node:diagnostics_channel')
+const util = require('node:util')
 
 const undiciDebugLog = util.debuglog('undici')
 const fetchDebuglog = util.debuglog('fetch')
diff --git a/lib/core/request.js b/lib/core/request.js
index 4a61da0e454..7f8a82e6701 100644
--- a/lib/core/request.js
+++ b/lib/core/request.js
@@ -4,7 +4,7 @@ const {
   InvalidArgumentError,
   NotSupportedError
 } = require('./errors')
-const assert = require('assert')
+const assert = require('node:assert')
 const { kHTTP2BuildRequest, kHTTP2CopyHeaders, kHTTP1BuildRequest } = require('./symbols')
 const util = require('./util')
 const { channels } = require('./diagnostics.js')
diff --git a/lib/core/util.js b/lib/core/util.js
index 94a8a04c89e..69fe8956825 100644
--- a/lib/core/util.js
+++ b/lib/core/util.js
@@ -1,14 +1,14 @@
 'use strict'
 
-const assert = require('assert')
+const assert = require('node:assert')
 const { kDestroyed, kBodyUsed } = require('./symbols')
-const { IncomingMessage } = require('http')
-const stream = require('stream')
-const net = require('net')
+const { IncomingMessage } = require('node:http')
+const stream = require('node:stream')
+const net = require('node:net')
 const { InvalidArgumentError } = require('./errors')
-const { Blob } = require('buffer')
-const nodeUtil = require('util')
-const { stringify } = require('querystring')
+const { Blob } = require('node:buffer')
+const nodeUtil = require('node:util')
+const { stringify } = require('node:querystring')
 const { headerNameLowerCasedRecord } = require('./constants')
 const { tree } = require('./tree')
 
diff --git a/lib/dispatcher.js b/lib/dispatcher.js
index 9b809d892d0..71db7e2bb49 100644
--- a/lib/dispatcher.js
+++ b/lib/dispatcher.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const EventEmitter = require('events')
+const EventEmitter = require('node:events')
 
 class Dispatcher extends EventEmitter {
   dispatch () {
diff --git a/lib/fetch/body.js b/lib/fetch/body.js
index 16914c14c8f..621c5a2d47b 100644
--- a/lib/fetch/body.js
+++ b/lib/fetch/body.js
@@ -13,9 +13,9 @@ const {
 const { FormData } = require('./formdata')
 const { kState } = require('./symbols')
 const { webidl } = require('./webidl')
-const { Blob, File: NativeFile } = require('buffer')
+const { Blob, File: NativeFile } = require('node:buffer')
 const { kBodyUsed, kHeadersList } = require('../core/symbols')
-const assert = require('assert')
+const assert = require('node:assert')
 const { isErrored } = require('../core/util')
 const { isUint8Array, isArrayBuffer } = require('util/types')
 const { File: UndiciFile } = require('./file')
diff --git a/lib/fetch/dataURL.js b/lib/fetch/dataURL.js
index d7a638866a3..2b78efdaf27 100644
--- a/lib/fetch/dataURL.js
+++ b/lib/fetch/dataURL.js
@@ -1,4 +1,4 @@
-const assert = require('assert')
+const assert = require('node:assert')
 const { isomorphicDecode } = require('./util')
 
 const encoder = new TextEncoder()
diff --git a/lib/fetch/file.js b/lib/fetch/file.js
index 397994c0d93..e4230880c92 100644
--- a/lib/fetch/file.js
+++ b/lib/fetch/file.js
@@ -1,7 +1,7 @@
 'use strict'
 
-const { Blob, File: NativeFile } = require('buffer')
-const { types } = require('util')
+const { Blob, File: NativeFile } = require('node:buffer')
+const { types } = require('node:util')
 const { kState } = require('./symbols')
 const { isBlobLike } = require('./util')
 const { webidl } = require('./webidl')
diff --git a/lib/fetch/formdata.js b/lib/fetch/formdata.js
index 5975e26c1a0..ea5163f4e37 100644
--- a/lib/fetch/formdata.js
+++ b/lib/fetch/formdata.js
@@ -4,7 +4,7 @@ const { isBlobLike, toUSVString, makeIterator } = require('./util')
 const { kState } = require('./symbols')
 const { File: UndiciFile, FileLike, isFileLike } = require('./file')
 const { webidl } = require('./webidl')
-const { Blob, File: NativeFile } = require('buffer')
+const { Blob, File: NativeFile } = require('node:buffer')
 
 /** @type {globalThis['File']} */
 const File = NativeFile ?? UndiciFile
diff --git a/lib/fetch/headers.js b/lib/fetch/headers.js
index a905baef499..e1619faf008 100644
--- a/lib/fetch/headers.js
+++ b/lib/fetch/headers.js
@@ -11,7 +11,7 @@ const {
   isValidHeaderValue
 } = require('./util')
 const { webidl } = require('./webidl')
-const assert = require('assert')
+const assert = require('node:assert')
 
 const kHeadersMap = Symbol('headers map')
 const kHeadersSortedMap = Symbol('headers map sorted')
diff --git a/lib/fetch/index.js b/lib/fetch/index.js
index 06fd8a1d589..d14f4f998fd 100644
--- a/lib/fetch/index.js
+++ b/lib/fetch/index.js
@@ -11,7 +11,7 @@ const {
 } = require('./response')
 const { HeadersList } = require('./headers')
 const { Request, makeRequest } = require('./request')
-const zlib = require('zlib')
+const zlib = require('node:zlib')
 const {
   bytesMatch,
   makePolicyContainer,
@@ -47,7 +47,7 @@ const {
   createInflate
 } = require('./util')
 const { kState } = require('./symbols')
-const assert = require('assert')
+const assert = require('node:assert')
 const { safelyExtractBody, extractBody } = require('./body')
 const {
   redirectStatusSet,
@@ -56,13 +56,13 @@ const {
   requestBodyHeader,
   subresourceSet
 } = require('./constants')
-const EE = require('events')
-const { Readable, pipeline } = require('stream')
+const EE = require('node:events')
+const { Readable, pipeline } = require('node:stream')
 const { addAbortListener, isErrored, isReadable, nodeMajor, nodeMinor, bufferToLowerCasedHeaderName } = require('../core/util')
 const { dataURLProcessor, serializeAMimeType, parseMIMEType } = require('./dataURL')
 const { getGlobalDispatcher } = require('../global')
 const { webidl } = require('./webidl')
-const { STATUS_CODES } = require('http')
+const { STATUS_CODES } = require('node:http')
 const GET_OR_HEAD = ['GET', 'HEAD']
 
 /** @type {import('buffer').resolveObjectURL} */
@@ -794,7 +794,7 @@ function schemeFetch (fetchParams) {
     }
     case 'blob:': {
       if (!resolveObjectURL) {
-        resolveObjectURL = require('buffer').resolveObjectURL
+        resolveObjectURL = require('node:buffer').resolveObjectURL
       }
 
       // 1. Let blobURLEntry be request’s current URL’s blob URL entry.
diff --git a/lib/fetch/request.js b/lib/fetch/request.js
index a23e6644c11..998e407e527 100644
--- a/lib/fetch/request.js
+++ b/lib/fetch/request.js
@@ -29,8 +29,8 @@ const { webidl } = require('./webidl')
 const { getGlobalOrigin } = require('./global')
 const { URLSerializer } = require('./dataURL')
 const { kHeadersList, kConstruct } = require('../core/symbols')
-const assert = require('assert')
-const { getMaxListeners, setMaxListeners, getEventListeners, defaultMaxListeners } = require('events')
+const assert = require('node:assert')
+const { getMaxListeners, setMaxListeners, getEventListeners, defaultMaxListeners } = require('node:events')
 
 const kAbortController = Symbol('abortController')
 
diff --git a/lib/fetch/response.js b/lib/fetch/response.js
index b8fc425891e..3255b78dab7 100644
--- a/lib/fetch/response.js
+++ b/lib/fetch/response.js
@@ -23,8 +23,8 @@ const { FormData } = require('./formdata')
 const { getGlobalOrigin } = require('./global')
 const { URLSerializer } = require('./dataURL')
 const { kHeadersList, kConstruct } = require('../core/symbols')
-const assert = require('assert')
-const { types } = require('util')
+const assert = require('node:assert')
+const { types } = require('node:util')
 
 const textEncoder = new TextEncoder('utf-8')
 
diff --git a/lib/fetch/util.js b/lib/fetch/util.js
index b179145c825..ebc9b41601b 100644
--- a/lib/fetch/util.js
+++ b/lib/fetch/util.js
@@ -4,9 +4,9 @@ const { Transform } = require('node:stream')
 const zlib = require('node:zlib')
 const { redirectStatusSet, referrerPolicySet: referrerPolicyTokens, badPortsSet } = require('./constants')
 const { getGlobalOrigin } = require('./global')
-const { performance } = require('perf_hooks')
+const { performance } = require('node:perf_hooks')
 const { isBlobLike, toUSVString, ReadableStreamFrom, isValidHTTPToken } = require('../core/util')
-const assert = require('assert')
+const assert = require('node:assert')
 const { isUint8Array } = require('util/types')
 
 // https://nodejs.org/api/crypto.html#determining-if-crypto-support-is-unavailable
@@ -14,7 +14,7 @@ const { isUint8Array } = require('util/types')
 let crypto
 
 try {
-  crypto = require('crypto')
+  crypto = require('node:crypto')
 } catch {
 
 }
diff --git a/lib/fetch/webidl.js b/lib/fetch/webidl.js
index e43cdf6aecc..cb6bcc37db9 100644
--- a/lib/fetch/webidl.js
+++ b/lib/fetch/webidl.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const { types } = require('util')
+const { types } = require('node:util')
 const { toUSVString } = require('./util')
 
 /** @type {import('../../types/webidl').Webidl} */
diff --git a/lib/fileapi/util.js b/lib/fileapi/util.js
index a29423d9d14..ce8b10aa2de 100644
--- a/lib/fileapi/util.js
+++ b/lib/fileapi/util.js
@@ -10,9 +10,9 @@ const {
 const { ProgressEvent } = require('./progressevent')
 const { getEncoding } = require('./encoding')
 const { serializeAMimeType, parseMIMEType } = require('../fetch/dataURL')
-const { types } = require('util')
+const { types } = require('node:util')
 const { StringDecoder } = require('string_decoder')
-const { btoa } = require('buffer')
+const { btoa } = require('node:buffer')
 
 /** @type {PropertyDescriptor} */
 const staticPropertyDescriptors = {
diff --git a/lib/handler/RedirectHandler.js b/lib/handler/RedirectHandler.js
index f95ac7e6076..368ef520d76 100644
--- a/lib/handler/RedirectHandler.js
+++ b/lib/handler/RedirectHandler.js
@@ -2,9 +2,9 @@
 
 const util = require('../core/util')
 const { kBodyUsed } = require('../core/symbols')
-const assert = require('assert')
+const assert = require('node:assert')
 const { InvalidArgumentError } = require('../core/errors')
-const EE = require('events')
+const EE = require('node:events')
 
 const redirectableStatusCodes = [300, 301, 302, 303, 307, 308]
 
diff --git a/lib/handler/RetryHandler.js b/lib/handler/RetryHandler.js
index da35d256baa..13eb1005083 100644
--- a/lib/handler/RetryHandler.js
+++ b/lib/handler/RetryHandler.js
@@ -1,4 +1,4 @@
-const assert = require('assert')
+const assert = require('node:assert')
 
 const { kRetryHandlerDefaultRetry } = require('../core/symbols')
 const { RequestRetryError } = require('../core/errors')
diff --git a/lib/mock/mock-client.js b/lib/mock/mock-client.js
index 5f312159623..193f217501d 100644
--- a/lib/mock/mock-client.js
+++ b/lib/mock/mock-client.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const { promisify } = require('util')
+const { promisify } = require('node:util')
 const Client = require('../client')
 const { buildMockDispatch } = require('./mock-utils')
 const {
diff --git a/lib/mock/mock-pool.js b/lib/mock/mock-pool.js
index 0a3a7cd35ea..17695e72eba 100644
--- a/lib/mock/mock-pool.js
+++ b/lib/mock/mock-pool.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const { promisify } = require('util')
+const { promisify } = require('node:util')
 const Pool = require('../pool')
 const { buildMockDispatch } = require('./mock-utils')
 const {
diff --git a/lib/mock/mock-utils.js b/lib/mock/mock-utils.js
index d6b00943564..96282f0ec9d 100644
--- a/lib/mock/mock-utils.js
+++ b/lib/mock/mock-utils.js
@@ -9,12 +9,12 @@ const {
   kGetNetConnect
 } = require('./mock-symbols')
 const { buildURL, nop } = require('../core/util')
-const { STATUS_CODES } = require('http')
+const { STATUS_CODES } = require('node:http')
 const {
   types: {
     isPromise
   }
-} = require('util')
+} = require('node:util')
 
 function matchValue (match, value) {
   if (typeof match === 'string') {
diff --git a/lib/mock/pending-interceptors-formatter.js b/lib/mock/pending-interceptors-formatter.js
index 1bc7539fd2e..ba6e4ebce1b 100644
--- a/lib/mock/pending-interceptors-formatter.js
+++ b/lib/mock/pending-interceptors-formatter.js
@@ -1,7 +1,7 @@
 'use strict'
 
-const { Transform } = require('stream')
-const { Console } = require('console')
+const { Transform } = require('node:stream')
+const { Console } = require('node:console')
 
 /**
  * Gets the output of `console.table(…)` as a string.
diff --git a/lib/proxy-agent.js b/lib/proxy-agent.js
index c0b5a24bfd1..54b078a7d62 100644
--- a/lib/proxy-agent.js
+++ b/lib/proxy-agent.js
@@ -1,7 +1,7 @@
 'use strict'
 
 const { kProxy, kClose, kDestroy, kInterceptors } = require('./core/symbols')
-const { URL } = require('url')
+const { URL } = require('node:url')
 const Agent = require('./agent')
 const Pool = require('./pool')
 const DispatcherBase = require('./dispatcher-base')
diff --git a/lib/websocket/connection.js b/lib/websocket/connection.js
index d8a4f04f637..399c3f52f14 100644
--- a/lib/websocket/connection.js
+++ b/lib/websocket/connection.js
@@ -19,7 +19,7 @@ const { kHeadersList } = require('../core/symbols')
 /** @type {import('crypto')} */
 let crypto
 try {
-  crypto = require('crypto')
+  crypto = require('node:crypto')
 } catch {
 
 }
diff --git a/lib/websocket/events.js b/lib/websocket/events.js
index 621a2263b7d..626e8da0583 100644
--- a/lib/websocket/events.js
+++ b/lib/websocket/events.js
@@ -2,7 +2,7 @@
 
 const { webidl } = require('../fetch/webidl')
 const { kEnumerableProperty } = require('../core/util')
-const { MessagePort } = require('worker_threads')
+const { MessagePort } = require('node:worker_threads')
 
 /**
  * @see https://html.spec.whatwg.org/multipage/comms.html#messageevent
diff --git a/lib/websocket/frame.js b/lib/websocket/frame.js
index d867ad118b2..ee3087bdf70 100644
--- a/lib/websocket/frame.js
+++ b/lib/websocket/frame.js
@@ -5,7 +5,7 @@ const { maxUnsigned16Bit } = require('./constants')
 /** @type {import('crypto')} */
 let crypto
 try {
-  crypto = require('crypto')
+  crypto = require('node:crypto')
 } catch {
 
 }
diff --git a/lib/websocket/receiver.js b/lib/websocket/receiver.js
index 512ef42a06b..b8b63ceb9d8 100644
--- a/lib/websocket/receiver.js
+++ b/lib/websocket/receiver.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const { Writable } = require('stream')
+const { Writable } = require('node:stream')
 const { parserStates, opcodes, states, emptyBuffer } = require('./constants')
 const { kReadyState, kSentClose, kResponse, kReceivedClose } = require('./symbols')
 const { channels } = require('../core/diagnostics')
diff --git a/lib/websocket/websocket.js b/lib/websocket/websocket.js
index 77a12396dcd..6cbd01666ef 100644
--- a/lib/websocket/websocket.js
+++ b/lib/websocket/websocket.js
@@ -19,7 +19,7 @@ const { WebsocketFrameSend } = require('./frame')
 const { ByteParser } = require('./receiver')
 const { kEnumerableProperty, isBlobLike } = require('../core/util')
 const { getGlobalDispatcher } = require('../global')
-const { types } = require('util')
+const { types } = require('node:util')
 
 let experimentalWarned = false
 
diff --git a/test/client-connect.js b/test/client-connect.js
index 4131c6e0a13..587361f9ef0 100644
--- a/test/client-connect.js
+++ b/test/client-connect.js
@@ -2,8 +2,8 @@
 
 const { test } = require('tap')
 const { Client, errors } = require('..')
-const http = require('http')
-const EE = require('events')
+const http = require('node:http')
+const EE = require('node:events')
 const { kBusy } = require('../lib/core/symbols')
 
 // TODO: move to test/node-test/client-connect.js
diff --git a/test/client-errors.js b/test/client-errors.js
index 27cc52ba562..21732ac075a 100644
--- a/test/client-errors.js
+++ b/test/client-errors.js
@@ -2,7 +2,7 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const net = require('net')
+const net = require('node:net')
 
 // TODO: move to test/node-test/client-connect.js
 test('parser error', (t) => {
diff --git a/test/client-head-reset-override.js b/test/client-head-reset-override.js
index a7d79e25d75..9639e94860d 100644
--- a/test/client-head-reset-override.js
+++ b/test/client-head-reset-override.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const { test } = require('tap')
 const { Client } = require('..')
 
diff --git a/test/client-idempotent-body.js b/test/client-idempotent-body.js
index 99e53713d00..0575b6b8ebd 100644
--- a/test/client-idempotent-body.js
+++ b/test/client-idempotent-body.js
@@ -2,7 +2,7 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 
 test('idempotent retry', (t) => {
   t.plan(11)
diff --git a/test/client-keep-alive.js b/test/client-keep-alive.js
index 393807be9db..924874232d7 100644
--- a/test/client-keep-alive.js
+++ b/test/client-keep-alive.js
@@ -4,8 +4,8 @@ const { test } = require('tap')
 const { Client } = require('..')
 const timers = require('../lib/timers')
 const { kConnect } = require('../lib/core/symbols')
-const { createServer } = require('net')
-const http = require('http')
+const { createServer } = require('node:net')
+const http = require('node:http')
 const FakeTimers = require('@sinonjs/fake-timers')
 
 test('keep-alive header', (t) => {
diff --git a/test/client-pipeline.js b/test/client-pipeline.js
index 75b59e83422..300e42c7eb2 100644
--- a/test/client-pipeline.js
+++ b/test/client-pipeline.js
@@ -2,15 +2,15 @@
 
 const { test } = require('tap')
 const { Client, errors } = require('..')
-const EE = require('events')
-const { createServer } = require('http')
+const EE = require('node:events')
+const { createServer } = require('node:http')
 const {
   pipeline,
   Readable,
   Transform,
   Writable,
   PassThrough
-} = require('stream')
+} = require('node:stream')
 
 test('pipeline get', (t) => {
   t.plan(17)
diff --git a/test/client-pipelining.js b/test/client-pipelining.js
index 8cd21feed10..38a99f54c5b 100644
--- a/test/client-pipelining.js
+++ b/test/client-pipelining.js
@@ -2,10 +2,10 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const { createServer } = require('http')
-const { finished, Readable } = require('stream')
+const { createServer } = require('node:http')
+const { finished, Readable } = require('node:stream')
 const { kConnect } = require('../lib/core/symbols')
-const EE = require('events')
+const EE = require('node:events')
 const { kBusy, kRunning, kSize } = require('../lib/core/symbols')
 const { maybeWrapStream, consts } = require('./utils/async-iterators')
 
diff --git a/test/client-post.js b/test/client-post.js
index 363b43ca34d..fc696c951a5 100644
--- a/test/client-post.js
+++ b/test/client-post.js
@@ -2,8 +2,8 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const { createServer } = require('http')
-const { Blob } = require('buffer')
+const { createServer } = require('node:http')
+const { Blob } = require('node:buffer')
 
 test('request post blob', { skip: !Blob }, (t) => {
   t.plan(4)
diff --git a/test/client-reconnect.js b/test/client-reconnect.js
index ae1a206de63..85f76ef5f62 100644
--- a/test/client-reconnect.js
+++ b/test/client-reconnect.js
@@ -2,7 +2,7 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const FakeTimers = require('@sinonjs/fake-timers')
 const timers = require('../lib/timers')
 
diff --git a/test/client-request.js b/test/client-request.js
index 3f74ce8cc70..ebcc0c2e96f 100644
--- a/test/client-request.js
+++ b/test/client-request.js
@@ -4,12 +4,12 @@
 
 const { test } = require('tap')
 const { Client, errors } = require('..')
-const { createServer } = require('http')
-const EE = require('events')
+const { createServer } = require('node:http')
+const EE = require('node:events')
 const { kConnect } = require('../lib/core/symbols')
-const { Readable } = require('stream')
-const net = require('net')
-const { promisify } = require('util')
+const { Readable } = require('node:stream')
+const net = require('node:net')
+const { promisify } = require('node:util')
 const { NotSupportedError } = require('../lib/core/errors')
 const { parseFormDataString } = require('./utils/formdata')
 
@@ -719,7 +719,7 @@ test('request text2', (t) => {
 
 test('request with FormData body', (t) => {
   const { FormData } = require('../')
-  const { Blob } = require('buffer')
+  const { Blob } = require('node:buffer')
 
   const fd = new FormData()
   fd.set('key', 'value')
diff --git a/test/client-stream.js b/test/client-stream.js
index a230c443b67..7732187f159 100644
--- a/test/client-stream.js
+++ b/test/client-stream.js
@@ -2,9 +2,9 @@
 
 const { test } = require('tap')
 const { Client, errors } = require('..')
-const { createServer } = require('http')
-const { PassThrough, Writable, Readable } = require('stream')
-const EE = require('events')
+const { createServer } = require('node:http')
+const { PassThrough, Writable, Readable } = require('node:stream')
+const EE = require('node:events')
 
 test('stream get', (t) => {
   t.plan(9)
diff --git a/test/client-timeout.js b/test/client-timeout.js
index 5f1686a0251..e02c46ceff3 100644
--- a/test/client-timeout.js
+++ b/test/client-timeout.js
@@ -2,8 +2,8 @@
 
 const { test } = require('tap')
 const { Client, errors } = require('..')
-const { createServer } = require('http')
-const { Readable } = require('stream')
+const { createServer } = require('node:http')
+const { Readable } = require('node:stream')
 const FakeTimers = require('@sinonjs/fake-timers')
 const timers = require('../lib/timers')
 
diff --git a/test/client-unref.js b/test/client-unref.js
index c7e3a5db734..f46376f9c46 100644
--- a/test/client-unref.js
+++ b/test/client-unref.js
@@ -1,10 +1,10 @@
 'use strict'
 
-const { Worker, isMainThread, workerData } = require('worker_threads')
+const { Worker, isMainThread, workerData } = require('node:worker_threads')
 
 if (isMainThread) {
   const tap = require('tap')
-  const { createServer } = require('http')
+  const { createServer } = require('node:http')
 
   tap.test('client automatically closes itself when idle', t => {
     t.plan(1)
diff --git a/test/client-upgrade.js b/test/client-upgrade.js
index 4ccbcce01ef..80aa7314b30 100644
--- a/test/client-upgrade.js
+++ b/test/client-upgrade.js
@@ -2,9 +2,9 @@
 
 const { test } = require('tap')
 const { Client, errors } = require('..')
-const net = require('net')
-const http = require('http')
-const EE = require('events')
+const net = require('node:net')
+const http = require('node:http')
+const EE = require('node:events')
 const { kBusy } = require('../lib/core/symbols')
 
 test('basic upgrade', (t) => {
diff --git a/test/client-write-max-listeners.js b/test/client-write-max-listeners.js
index 118cdaad0b5..c511fb4fb68 100644
--- a/test/client-write-max-listeners.js
+++ b/test/client-write-max-listeners.js
@@ -2,8 +2,8 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const { createServer } = require('http')
-const { Readable } = require('stream')
+const { createServer } = require('node:http')
+const { Readable } = require('node:stream')
 
 test('socket close listener does not leak', (t) => {
   t.plan(32)
diff --git a/test/client.js b/test/client.js
index 92315d647e5..5aa031f6907 100644
--- a/test/client.js
+++ b/test/client.js
@@ -1,17 +1,17 @@
 'use strict'
 
-const { readFileSync, createReadStream } = require('fs')
-const { createServer } = require('http')
-const { Readable } = require('stream')
+const { readFileSync, createReadStream } = require('node:fs')
+const { createServer } = require('node:http')
+const { Readable } = require('node:stream')
 const { test } = require('tap')
 const { Client, errors } = require('..')
 const { kSocket } = require('../lib/core/symbols')
 const { wrapWithAsyncIterable } = require('./utils/async-iterators')
-const EE = require('events')
+const EE = require('node:events')
 const { kUrl, kSize, kConnect, kBusy, kConnected, kRunning } = require('../lib/core/symbols')
 
 const hasIPv6 = (() => {
-  const iFaces = require('os').networkInterfaces()
+  const iFaces = require('node:os').networkInterfaces()
   const re = process.platform === 'win32' ? /Loopback Pseudo-Interface/ : /lo/
   return Object.keys(iFaces).some(
     (name) => re.test(name) && iFaces[name].some(({ family }) => family === 6)
diff --git a/test/close-and-destroy.js b/test/close-and-destroy.js
index bd50ebb8e99..6675e1d2cd0 100644
--- a/test/close-and-destroy.js
+++ b/test/close-and-destroy.js
@@ -2,7 +2,7 @@
 
 const { test } = require('tap')
 const { Client, errors } = require('..')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const { kSocket, kSize } = require('../lib/core/symbols')
 
 test('close waits for queued requests to finish', (t) => {
diff --git a/test/connect-abort.js b/test/connect-abort.js
index 6eb36243866..91ed1b2a258 100644
--- a/test/connect-abort.js
+++ b/test/connect-abort.js
@@ -2,7 +2,7 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const { PassThrough } = require('stream')
+const { PassThrough } = require('node:stream')
 
 test(t => {
   t.plan(2)
diff --git a/test/connect-errconnect.js b/test/connect-errconnect.js
index defeda32454..885d6ddb19c 100644
--- a/test/connect-errconnect.js
+++ b/test/connect-errconnect.js
@@ -2,7 +2,7 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const net = require('net')
+const net = require('node:net')
 
 test('connect-connectionError', t => {
   t.plan(2)
diff --git a/test/connect-timeout.js b/test/connect-timeout.js
index d998321da82..9c001a35d97 100644
--- a/test/connect-timeout.js
+++ b/test/connect-timeout.js
@@ -2,7 +2,7 @@
 
 const { test } = require('tap')
 const { Client, Pool, errors } = require('..')
-const net = require('net')
+const net = require('node:net')
 const sleep = ms => Atomics.wait(new Int32Array(new SharedArrayBuffer(4)), 0, 0, Number(ms))
 
 test('prioritize socket errors over timeouts', (t) => {
diff --git a/test/content-length.js b/test/content-length.js
index 9ce74051d8b..0257e4d62a4 100644
--- a/test/content-length.js
+++ b/test/content-length.js
@@ -2,8 +2,8 @@
 
 const { test } = require('tap')
 const { Client, errors } = require('..')
-const { createServer } = require('http')
-const { Readable } = require('stream')
+const { createServer } = require('node:http')
+const { Readable } = require('node:stream')
 const { maybeWrapStream, consts } = require('./utils/async-iterators')
 
 test('request invalid content-length', (t) => {
diff --git a/test/examples.js b/test/examples.js
index 9b814820cb8..7096970662f 100644
--- a/test/examples.js
+++ b/test/examples.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const { test } = require('tap')
 const examples = require('../examples/request.js')
 
diff --git a/test/fetch/407-statuscode-window-null.js b/test/fetch/407-statuscode-window-null.js
index 8304570976b..e03042e4c09 100644
--- a/test/fetch/407-statuscode-window-null.js
+++ b/test/fetch/407-statuscode-window-null.js
@@ -1,8 +1,8 @@
 'use strict'
 
 const { fetch } = require('../..')
-const { createServer } = require('http')
-const { once } = require('events')
+const { createServer } = require('node:http')
+const { once } = require('node:events')
 const { test } = require('node:test')
 const assert = require('node:assert')
 
diff --git a/test/fetch/abort.js b/test/fetch/abort.js
index f2c98e46698..018c9a10b68 100644
--- a/test/fetch/abort.js
+++ b/test/fetch/abort.js
@@ -4,8 +4,8 @@ const { test } = require('node:test')
 const assert = require('node:assert')
 const { tspl } = require('@matteo.collina/tspl')
 const { fetch } = require('../..')
-const { createServer } = require('http')
-const { once } = require('events')
+const { createServer } = require('node:http')
+const { once } = require('node:events')
 
 const { closeServerAsPromise } = require('../utils/node-http')
 
diff --git a/test/fetch/abort2.js b/test/fetch/abort2.js
index 6a1e243cdec..fec300b43df 100644
--- a/test/fetch/abort2.js
+++ b/test/fetch/abort2.js
@@ -3,8 +3,8 @@
 const { test } = require('node:test')
 const assert = require('node:assert')
 const { fetch } = require('../..')
-const { createServer } = require('http')
-const { once } = require('events')
+const { createServer } = require('node:http')
+const { once } = require('node:events')
 
 const { closeServerAsPromise } = require('../utils/node-http')
 
diff --git a/test/fetch/blob-uri.js b/test/fetch/blob-uri.js
index 9ba2c5f30ca..5d3d3f4dfd3 100644
--- a/test/fetch/blob-uri.js
+++ b/test/fetch/blob-uri.js
@@ -3,7 +3,7 @@
 const { test } = require('node:test')
 const assert = require('node:assert')
 const { fetch } = require('../..')
-const { Blob } = require('buffer')
+const { Blob } = require('node:buffer')
 
 test('fetching blob: uris', async (t) => {
   const blobContents = 'hello world'
diff --git a/test/fetch/client-fetch.js b/test/fetch/client-fetch.js
index 075bda7ec05..e0fcb97eca1 100644
--- a/test/fetch/client-fetch.js
+++ b/test/fetch/client-fetch.js
@@ -5,15 +5,15 @@
 const { test, after } = require('node:test')
 const assert = require('node:assert')
 const { tspl } = require('@matteo.collina/tspl')
-const { createServer } = require('http')
-const { Blob } = require('buffer')
+const { createServer } = require('node:http')
+const { Blob } = require('node:buffer')
 const { fetch, Response, Request, FormData, File } = require('../..')
 const { Client, setGlobalDispatcher, Agent } = require('../..')
 const nodeFetch = require('../../index-fetch')
-const { once } = require('events')
-const { gzipSync } = require('zlib')
-const { promisify } = require('util')
-const { randomFillSync, createHash } = require('crypto')
+const { once } = require('node:events')
+const { gzipSync } = require('node:zlib')
+const { promisify } = require('node:util')
+const { randomFillSync, createHash } = require('node:crypto')
 
 const { closeServerAsPromise } = require('../utils/node-http')
 
diff --git a/test/fetch/content-length.js b/test/fetch/content-length.js
index 384ba2491d6..637ff0b800e 100644
--- a/test/fetch/content-length.js
+++ b/test/fetch/content-length.js
@@ -2,9 +2,9 @@
 
 const { test } = require('node:test')
 const assert = require('node:assert')
-const { createServer } = require('http')
-const { once } = require('events')
-const { Blob } = require('buffer')
+const { createServer } = require('node:http')
+const { once } = require('node:events')
+const { Blob } = require('node:buffer')
 const { fetch, FormData } = require('../..')
 const { closeServerAsPromise } = require('../utils/node-http')
 
diff --git a/test/fetch/cookies.js b/test/fetch/cookies.js
index 900c2d3a22b..c34f3dc921a 100644
--- a/test/fetch/cookies.js
+++ b/test/fetch/cookies.js
@@ -1,7 +1,7 @@
 'use strict'
 
-const { once } = require('events')
-const { createServer } = require('http')
+const { once } = require('node:events')
+const { createServer } = require('node:http')
 const { test } = require('node:test')
 const assert = require('node:assert')
 const { tspl } = require('@matteo.collina/tspl')
diff --git a/test/fetch/encoding.js b/test/fetch/encoding.js
index 5e8c3149dc9..3986e03e505 100644
--- a/test/fetch/encoding.js
+++ b/test/fetch/encoding.js
@@ -2,10 +2,10 @@
 
 const { test } = require('node:test')
 const assert = require('node:assert')
-const { createServer } = require('http')
-const { once } = require('events')
+const { createServer } = require('node:http')
+const { once } = require('node:events')
 const { fetch } = require('../..')
-const { createBrotliCompress, createGzip, createDeflate } = require('zlib')
+const { createBrotliCompress, createGzip, createDeflate } = require('node:zlib')
 const { closeServerAsPromise } = require('../utils/node-http')
 
 test('content-encoding header is case-iNsENsITIve', async (t) => {
diff --git a/test/fetch/fetch-leak.js b/test/fetch/fetch-leak.js
index 21838d4bde6..a0b2995025d 100644
--- a/test/fetch/fetch-leak.js
+++ b/test/fetch/fetch-leak.js
@@ -4,7 +4,7 @@ const { test } = require('node:test')
 const assert = require('node:assert')
 const { tspl } = require('@matteo.collina/tspl')
 const { fetch } = require('../..')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const { closeServerAsPromise } = require('../utils/node-http')
 
 test('do not leak', (t, done) => {
diff --git a/test/fetch/fetch-timeouts.js b/test/fetch/fetch-timeouts.js
index 71a2f36897f..93792871cb1 100644
--- a/test/fetch/fetch-timeouts.js
+++ b/test/fetch/fetch-timeouts.js
@@ -5,7 +5,7 @@ const { tspl } = require('@matteo.collina/tspl')
 
 const { fetch, Agent } = require('../..')
 const timers = require('../../lib/timers')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const FakeTimers = require('@sinonjs/fake-timers')
 const { closeServerAsPromise } = require('../utils/node-http')
 
diff --git a/test/fetch/file.js b/test/fetch/file.js
index 877ce190469..44149653c12 100644
--- a/test/fetch/file.js
+++ b/test/fetch/file.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const { Blob } = require('buffer')
+const { Blob } = require('node:buffer')
 const { test } = require('node:test')
 const assert = require('node:assert')
 const { tspl } = require('@matteo.collina/tspl')
diff --git a/test/fetch/formdata.js b/test/fetch/formdata.js
index 157b7a77868..3558001f10a 100644
--- a/test/fetch/formdata.js
+++ b/test/fetch/formdata.js
@@ -5,7 +5,7 @@ const assert = require('node:assert')
 const { tspl } = require('@matteo.collina/tspl')
 const { FormData, File, Response } = require('../../')
 const { Blob: ThirdPartyBlob } = require('formdata-node')
-const { Blob } = require('buffer')
+const { Blob } = require('node:buffer')
 const { isFormDataLike } = require('../../lib/core/util')
 const ThirdPartyFormDataInvalid = require('form-data')
 
diff --git a/test/fetch/headers.js b/test/fetch/headers.js
index 3954ae11111..b61d8b612d2 100644
--- a/test/fetch/headers.js
+++ b/test/fetch/headers.js
@@ -5,9 +5,9 @@ const assert = require('node:assert')
 const { tspl } = require('@matteo.collina/tspl')
 const { Headers, fill } = require('../../lib/fetch/headers')
 const { kGuard } = require('../../lib/fetch/symbols')
-const { once } = require('events')
+const { once } = require('node:events')
 const { fetch } = require('../..')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const { closeServerAsPromise } = require('../utils/node-http')
 
 test('Headers initialization', async (t) => {
diff --git a/test/fetch/integrity.js b/test/fetch/integrity.js
index e401a06687e..f3bc27e4dc5 100644
--- a/test/fetch/integrity.js
+++ b/test/fetch/integrity.js
@@ -2,11 +2,11 @@
 
 const { test } = require('node:test')
 const assert = require('node:assert')
-const { createServer } = require('http')
-const { createHash, getHashes } = require('crypto')
-const { gzipSync } = require('zlib')
+const { createServer } = require('node:http')
+const { createHash, getHashes } = require('node:crypto')
+const { gzipSync } = require('node:zlib')
 const { fetch, setGlobalDispatcher, Agent } = require('../..')
-const { once } = require('events')
+const { once } = require('node:events')
 const { closeServerAsPromise } = require('../utils/node-http')
 
 const supportedHashes = getHashes()
diff --git a/test/fetch/issue-2009.js b/test/fetch/issue-2009.js
index 13d25b6444a..d77b60b6334 100644
--- a/test/fetch/issue-2009.js
+++ b/test/fetch/issue-2009.js
@@ -3,8 +3,8 @@
 const { test } = require('node:test')
 const { tspl } = require('@matteo.collina/tspl')
 const { fetch } = require('../..')
-const { createServer } = require('http')
-const { once } = require('events')
+const { createServer } = require('node:http')
+const { once } = require('node:events')
 const { closeServerAsPromise } = require('../utils/node-http')
 
 test('issue 2009', async (t) => {
diff --git a/test/fetch/issue-2021.js b/test/fetch/issue-2021.js
index be8941951cb..5b949e507de 100644
--- a/test/fetch/issue-2021.js
+++ b/test/fetch/issue-2021.js
@@ -2,8 +2,8 @@
 
 const { test } = require('node:test')
 const assert = require('node:assert')
-const { once } = require('events')
-const { createServer } = require('http')
+const { once } = require('node:events')
+const { createServer } = require('node:http')
 const { fetch } = require('../..')
 const { closeServerAsPromise } = require('../utils/node-http')
 
diff --git a/test/fetch/issue-2171.js b/test/fetch/issue-2171.js
index cb6350f6aaa..82577f9494c 100644
--- a/test/fetch/issue-2171.js
+++ b/test/fetch/issue-2171.js
@@ -1,8 +1,8 @@
 'use strict'
 
 const { fetch } = require('../..')
-const { once } = require('events')
-const { createServer } = require('http')
+const { once } = require('node:events')
+const { createServer } = require('node:http')
 const { test } = require('node:test')
 const assert = require('node:assert')
 const { closeServerAsPromise } = require('../utils/node-http')
diff --git a/test/fetch/issue-2318.js b/test/fetch/issue-2318.js
index 74f1f5578f8..273e2b9a74c 100644
--- a/test/fetch/issue-2318.js
+++ b/test/fetch/issue-2318.js
@@ -2,8 +2,8 @@
 
 const { test } = require('node:test')
 const { tspl } = require('@matteo.collina/tspl')
-const { once } = require('events')
-const { createServer } = require('http')
+const { once } = require('node:events')
+const { createServer } = require('node:http')
 const { fetch } = require('../..')
 const { closeServerAsPromise } = require('../utils/node-http')
 
diff --git a/test/fetch/issue-node-46525.js b/test/fetch/issue-node-46525.js
index 62f910f219f..b35eeb2a590 100644
--- a/test/fetch/issue-node-46525.js
+++ b/test/fetch/issue-node-46525.js
@@ -1,7 +1,7 @@
 'use strict'
 
-const { once } = require('events')
-const { createServer } = require('http')
+const { once } = require('node:events')
+const { createServer } = require('node:http')
 const { test } = require('node:test')
 const { fetch } = require('../..')
 
diff --git a/test/fetch/jsdom-abortcontroller-1910-1464495619.js b/test/fetch/jsdom-abortcontroller-1910-1464495619.js
index 15503e7ec5c..b59ef9f95ca 100644
--- a/test/fetch/jsdom-abortcontroller-1910-1464495619.js
+++ b/test/fetch/jsdom-abortcontroller-1910-1464495619.js
@@ -2,8 +2,8 @@
 
 const { test } = require('node:test')
 const assert = require('node:assert')
-const { createServer } = require('http')
-const { once } = require('events')
+const { createServer } = require('node:http')
+const { once } = require('node:events')
 const { fetch } = require('../..')
 const { JSDOM } = require('jsdom')
 
diff --git a/test/fetch/redirect-cross-origin-header.js b/test/fetch/redirect-cross-origin-header.js
index 244dbf61b51..5c1d91c9924 100644
--- a/test/fetch/redirect-cross-origin-header.js
+++ b/test/fetch/redirect-cross-origin-header.js
@@ -2,8 +2,8 @@
 
 const { test } = require('node:test')
 const { tspl } = require('@matteo.collina/tspl')
-const { createServer } = require('http')
-const { once } = require('events')
+const { createServer } = require('node:http')
+const { once } = require('node:events')
 const { fetch } = require('../..')
 
 test('Cross-origin redirects clear forbidden headers', async (t) => {
diff --git a/test/fetch/redirect.js b/test/fetch/redirect.js
index ebfd458199d..a9533bcc327 100644
--- a/test/fetch/redirect.js
+++ b/test/fetch/redirect.js
@@ -2,8 +2,8 @@
 
 const { test } = require('node:test')
 const assert = require('node:assert')
-const { createServer } = require('http')
-const { once } = require('events')
+const { createServer } = require('node:http')
+const { once } = require('node:events')
 const { fetch } = require('../..')
 const { closeServerAsPromise } = require('../utils/node-http')
 
diff --git a/test/fetch/relative-url.js b/test/fetch/relative-url.js
index 9d2480281be..2a57e15c5e5 100644
--- a/test/fetch/relative-url.js
+++ b/test/fetch/relative-url.js
@@ -2,8 +2,8 @@
 
 const { test, afterEach } = require('node:test')
 const assert = require('node:assert')
-const { createServer } = require('http')
-const { once } = require('events')
+const { createServer } = require('node:http')
+const { once } = require('node:events')
 const {
   getGlobalOrigin,
   setGlobalOrigin,
diff --git a/test/fetch/resource-timing.js b/test/fetch/resource-timing.js
index f561b723fcc..7617ff06328 100644
--- a/test/fetch/resource-timing.js
+++ b/test/fetch/resource-timing.js
@@ -2,7 +2,7 @@
 
 const { test } = require('node:test')
 const { tspl } = require('@matteo.collina/tspl')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const { nodeMajor, nodeMinor } = require('../../lib/core/util')
 const { fetch } = require('../..')
 const { closeServerAsPromise } = require('../utils/node-http')
@@ -10,7 +10,7 @@ const { closeServerAsPromise } = require('../utils/node-http')
 const {
   PerformanceObserver,
   performance
-} = require('perf_hooks')
+} = require('node:perf_hooks')
 
 const skip = nodeMajor === 18 && nodeMinor < 2
 
diff --git a/test/fetch/response-json.js b/test/fetch/response-json.js
index 618111b8510..7dc6ad20c37 100644
--- a/test/fetch/response-json.js
+++ b/test/fetch/response-json.js
@@ -1,7 +1,7 @@
 'use strict'
 
 const { test } = require('node:test')
-const assert = require('assert')
+const assert = require('node:assert')
 const { Response } = require('../../')
 
 // https://github.com/web-platform-tests/wpt/pull/32825/
diff --git a/test/fetch/response.js b/test/fetch/response.js
index 68f76fbe045..cfd4ddb6268 100644
--- a/test/fetch/response.js
+++ b/test/fetch/response.js
@@ -1,7 +1,7 @@
 'use strict'
 
 const { test } = require('node:test')
-const assert = require('assert')
+const assert = require('node:assert')
 const { tspl } = require('@matteo.collina/tspl')
 const {
   Response,
diff --git a/test/fetch/user-agent.js b/test/fetch/user-agent.js
index 1d638d0a3e7..da8936c8cff 100644
--- a/test/fetch/user-agent.js
+++ b/test/fetch/user-agent.js
@@ -1,9 +1,9 @@
 'use strict'
 
 const { test } = require('node:test')
-const assert = require('assert')
-const events = require('events')
-const http = require('http')
+const assert = require('node:assert')
+const events = require('node:events')
+const http = require('node:http')
 const undici = require('../../')
 const { closeServerAsPromise } = require('../utils/node-http')
 
diff --git a/test/fetch/util.js b/test/fetch/util.js
index 0330c7d8eed..eb245486f4d 100644
--- a/test/fetch/util.js
+++ b/test/fetch/util.js
@@ -1,11 +1,11 @@
 'use strict'
 
 const { test } = require('node:test')
-const assert = require('assert')
+const assert = require('node:assert')
 const { tspl } = require('@matteo.collina/tspl')
 const util = require('../../lib/fetch/util')
 const { HeadersList } = require('../../lib/fetch/headers')
-const { createHash } = require('crypto')
+const { createHash } = require('node:crypto')
 
 test('responseURL', (t) => {
   const { ok } = tspl(t, { plan: 2 })
diff --git a/test/fixtures/fetch.js b/test/fixtures/fetch.js
index ae4934a4e58..e6792ed1dbd 100644
--- a/test/fixtures/fetch.js
+++ b/test/fixtures/fetch.js
@@ -1,4 +1,4 @@
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const { fetch } = require('../..')
 
 const server = createServer((_req, res) => {
diff --git a/test/fixtures/undici.js b/test/fixtures/undici.js
index 8c6d5aac1d1..6ce69aa6785 100644
--- a/test/fixtures/undici.js
+++ b/test/fixtures/undici.js
@@ -1,4 +1,4 @@
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const { request } = require('../..')
 
 const server = createServer((_req, res) => {
diff --git a/test/fuzzing/fuzz.js b/test/fuzzing/fuzz.js
index c2681783741..0d938496309 100644
--- a/test/fuzzing/fuzz.js
+++ b/test/fuzzing/fuzz.js
@@ -1,8 +1,8 @@
 'use strict'
 
-const net = require('net')
+const net = require('node:net')
 const fs = require('fs/promises')
-const path = require('path')
+const path = require('node:path')
 const serverFuzzFnMap = require('./server')
 const clientFuzzFnMap = require('./client')
 
diff --git a/test/gc.js b/test/gc.js
index c1ceecf88ab..ab3b0e83dbf 100644
--- a/test/gc.js
+++ b/test/gc.js
@@ -2,7 +2,7 @@
 /* global WeakRef, FinalizationRegistry */
 
 const { test } = require('tap')
-const { createServer } = require('net')
+const { createServer } = require('node:net')
 const { Client, Pool } = require('..')
 
 const SKIP = typeof WeakRef === 'undefined' || typeof FinalizationRegistry === 'undefined'
diff --git a/test/get-head-body.js b/test/get-head-body.js
index 3e86b13bfd3..9b587980224 100644
--- a/test/get-head-body.js
+++ b/test/get-head-body.js
@@ -2,8 +2,8 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const { createServer } = require('http')
-const { Readable } = require('stream')
+const { createServer } = require('node:http')
+const { Readable } = require('node:stream')
 const { kConnect } = require('../lib/core/symbols')
 const { kBusy } = require('../lib/core/symbols')
 const { wrapWithAsyncIterable } = require('./utils/async-iterators')
diff --git a/test/headers-as-array.js b/test/headers-as-array.js
index fd8bb5dbf5b..315d55b4b64 100644
--- a/test/headers-as-array.js
+++ b/test/headers-as-array.js
@@ -2,7 +2,7 @@
 
 const { test } = require('tap')
 const { Client, errors } = require('..')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 
 test('handle headers as array', (t) => {
   t.plan(1)
diff --git a/test/headers-crlf.js b/test/headers-crlf.js
index b24fd391491..d41e924aca1 100644
--- a/test/headers-crlf.js
+++ b/test/headers-crlf.js
@@ -2,7 +2,7 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 
 test('CRLF Injection in Nodejs ‘undici’ via host', (t) => {
   t.plan(1)
diff --git a/test/http-100.js b/test/http-100.js
index 1662a8d6432..add1273d9c0 100644
--- a/test/http-100.js
+++ b/test/http-100.js
@@ -2,8 +2,8 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const { createServer } = require('http')
-const net = require('net')
+const { createServer } = require('node:http')
+const net = require('node:net')
 
 test('ignore informational response', (t) => {
   t.plan(2)
diff --git a/test/http-req-destroy.js b/test/http-req-destroy.js
index 29ec98e1a9c..d0d83b6d848 100644
--- a/test/http-req-destroy.js
+++ b/test/http-req-destroy.js
@@ -2,8 +2,8 @@
 
 const { test } = require('tap')
 const undici = require('..')
-const { createServer } = require('http')
-const { Readable } = require('stream')
+const { createServer } = require('node:http')
+const { Readable } = require('node:stream')
 const { maybeWrapStream, consts } = require('./utils/async-iterators')
 
 function doNotKillReqSocket (bodyType) {
diff --git a/test/https.js b/test/https.js
index 1ba492c0e33..5d9ab3d8e22 100644
--- a/test/https.js
+++ b/test/https.js
@@ -2,7 +2,7 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const { createServer } = require('https')
+const { createServer } = require('node:https')
 const pem = require('https-pem')
 
 test('https get with tls opts', (t) => {
diff --git a/test/inflight-and-close.js b/test/inflight-and-close.js
index 49fbb10f7fc..d1930ff1bed 100644
--- a/test/inflight-and-close.js
+++ b/test/inflight-and-close.js
@@ -2,7 +2,7 @@
 
 const t = require('tap')
 const { request } = require('..')
-const http = require('http')
+const http = require('node:http')
 
 const server = http.createServer((req, res) => {
   res.writeHead(200)
diff --git a/test/issue-2065.js b/test/issue-2065.js
index 9cc015b9824..5080353a584 100644
--- a/test/issue-2065.js
+++ b/test/issue-2065.js
@@ -1,9 +1,9 @@
 'use strict'
 
 const { test } = require('tap')
-const { createServer } = require('http')
-const { once } = require('events')
-const { createReadStream } = require('fs')
+const { createServer } = require('node:http')
+const { once } = require('node:events')
+const { createReadStream } = require('node:fs')
 const { File, FormData, request } = require('..')
 
 test('undici.request with a FormData body should set content-length header', async (t) => {
diff --git a/test/issue-2349.js b/test/issue-2349.js
index d6e0dcb2020..fa308227849 100644
--- a/test/issue-2349.js
+++ b/test/issue-2349.js
@@ -2,7 +2,7 @@
 
 const { test } = require('node:test')
 const { rejects } = require('node:assert')
-const { Writable } = require('stream')
+const { Writable } = require('node:stream')
 const { MockAgent, stream } = require('..')
 
 test('stream() does not fail after request has been aborted', () => {
diff --git a/test/issue-2590.js b/test/issue-2590.js
index 4f5b186dfd3..cd4913c642f 100644
--- a/test/issue-2590.js
+++ b/test/issue-2590.js
@@ -2,8 +2,8 @@
 
 const { test } = require('tap')
 const { request } = require('..')
-const { createServer } = require('http')
-const { once } = require('events')
+const { createServer } = require('node:http')
+const { once } = require('node:events')
 
 test('aborting request with custom reason', async (t) => {
   const server = createServer(() => {}).listen(0)
diff --git a/test/issue-803.js b/test/issue-803.js
index 70f64cce773..35975103967 100644
--- a/test/issue-803.js
+++ b/test/issue-803.js
@@ -2,8 +2,8 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const { createServer } = require('http')
-const EE = require('events')
+const { createServer } = require('node:http')
+const EE = require('node:events')
 
 test('https://github.com/nodejs/undici/issues/803', (t) => {
   t.plan(2)
diff --git a/test/issue-810.js b/test/issue-810.js
index 226a5aaacdb..ba4a35234e7 100644
--- a/test/issue-810.js
+++ b/test/issue-810.js
@@ -2,7 +2,7 @@
 
 const { test } = require('tap')
 const { Client, errors } = require('..')
-const net = require('net')
+const net = require('node:net')
 
 test('https://github.com/mcollina/undici/issues/810', (t) => {
   t.plan(3)
diff --git a/test/jest/instanceof-error.test.js b/test/jest/instanceof-error.test.js
index 2fa71565172..363ec7013e8 100644
--- a/test/jest/instanceof-error.test.js
+++ b/test/jest/instanceof-error.test.js
@@ -1,7 +1,7 @@
 'use strict'
 
-const { createServer } = require('http')
-const { once } = require('events')
+const { createServer } = require('node:http')
+const { once } = require('node:events')
 
 /* global expect, it, jest, AbortController */
 
diff --git a/test/jest/interceptor.test.js b/test/jest/interceptor.test.js
index 73d70b7c9cd..9caa0758936 100644
--- a/test/jest/interceptor.test.js
+++ b/test/jest/interceptor.test.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const { Agent, request } = require('../../index')
 const DecoratorHandler = require('../../lib/handler/DecoratorHandler')
 /* global expect */
diff --git a/test/jest/test.js b/test/jest/test.js
index 079a41ff195..4be7556e27e 100644
--- a/test/jest/test.js
+++ b/test/jest/test.js
@@ -1,7 +1,7 @@
 'use strict'
 
 const { Client } = require('../..')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 /* global test, expect */
 
 test('should work in jest', async () => {
diff --git a/test/max-headers.js b/test/max-headers.js
index a08b93154f6..9e7396ae76f 100644
--- a/test/max-headers.js
+++ b/test/max-headers.js
@@ -2,7 +2,7 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 
 test('handle a lot of headers', (t) => {
   t.plan(3)
diff --git a/test/max-response-size.js b/test/max-response-size.js
index 75bfade0351..ca6ad40fa42 100644
--- a/test/max-response-size.js
+++ b/test/max-response-size.js
@@ -2,7 +2,7 @@
 
 const { test } = require('tap')
 const { Client, errors } = require('..')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 
 test('max response size', (t) => {
   t.plan(4)
diff --git a/test/mock-agent.js b/test/mock-agent.js
index 66c583da4c5..42dfb9554cc 100644
--- a/test/mock-agent.js
+++ b/test/mock-agent.js
@@ -1,8 +1,8 @@
 'use strict'
 
 const { test } = require('tap')
-const { createServer } = require('http')
-const { promisify } = require('util')
+const { createServer } = require('node:http')
+const { promisify } = require('node:util')
 const { request, setGlobalDispatcher, MockAgent, Agent } = require('..')
 const { getResponse } = require('../lib/mock/mock-utils')
 const { kClients, kConnected } = require('../lib/core/symbols')
diff --git a/test/mock-client.js b/test/mock-client.js
index ef0600e68d2..7845135b139 100644
--- a/test/mock-client.js
+++ b/test/mock-client.js
@@ -1,8 +1,8 @@
 'use strict'
 
 const { test } = require('tap')
-const { createServer } = require('http')
-const { promisify } = require('util')
+const { createServer } = require('node:http')
+const { promisify } = require('node:util')
 const { MockAgent, MockClient, setGlobalDispatcher, request } = require('..')
 const { kUrl } = require('../lib/core/symbols')
 const { kDispatches } = require('../lib/mock/mock-symbols')
diff --git a/test/mock-pool.js b/test/mock-pool.js
index 682d02aab68..fa79796471e 100644
--- a/test/mock-pool.js
+++ b/test/mock-pool.js
@@ -1,8 +1,8 @@
 'use strict'
 
 const { test } = require('tap')
-const { createServer } = require('http')
-const { promisify } = require('util')
+const { createServer } = require('node:http')
+const { promisify } = require('node:util')
 const { MockAgent, MockPool, getGlobalDispatcher, setGlobalDispatcher, request } = require('..')
 const { kUrl } = require('../lib/core/symbols')
 const { kDispatches } = require('../lib/mock/mock-symbols')
diff --git a/test/no-strict-content-length.js b/test/no-strict-content-length.js
index 993b0fdcf7a..b16b82bc38e 100644
--- a/test/no-strict-content-length.js
+++ b/test/no-strict-content-length.js
@@ -2,8 +2,8 @@
 
 const tap = require('tap')
 const { Client } = require('..')
-const { createServer } = require('http')
-const { Readable } = require('stream')
+const { createServer } = require('node:http')
+const { Readable } = require('node:stream')
 const sinon = require('sinon')
 const { wrapWithAsyncIterable } = require('./utils/async-iterators')
 
diff --git a/test/node-fetch/headers.js b/test/node-fetch/headers.js
index e509fd8d893..2001e976efa 100644
--- a/test/node-fetch/headers.js
+++ b/test/node-fetch/headers.js
@@ -1,6 +1,6 @@
 /* eslint no-unused-expressions: "off" */
 
-const { format } = require('util')
+const { format } = require('node:util')
 const chai = require('chai')
 const chaiIterator = require('chai-iterator')
 const { Headers } = require('../../lib/fetch/headers.js')
diff --git a/test/node-fetch/main.js b/test/node-fetch/main.js
index e9f3fe700c8..7e6da3f984f 100644
--- a/test/node-fetch/main.js
+++ b/test/node-fetch/main.js
@@ -2,15 +2,15 @@
 /* globals AbortController */
 
 // Test tools
-const zlib = require('zlib')
-const stream = require('stream')
-const vm = require('vm')
+const zlib = require('node:zlib')
+const stream = require('node:stream')
+const vm = require('node:vm')
 const chai = require('chai')
-const crypto = require('crypto')
+const crypto = require('node:crypto')
 const chaiPromised = require('chai-as-promised')
 const chaiIterator = require('chai-iterator')
 const chaiString = require('chai-string')
-const { Blob } = require('buffer')
+const { Blob } = require('node:buffer')
 const { setTimeout: delay } = require('timers/promises')
 
 const {
diff --git a/test/node-fetch/request.js b/test/node-fetch/request.js
index 2d29d517f72..405bc2c467e 100644
--- a/test/node-fetch/request.js
+++ b/test/node-fetch/request.js
@@ -1,8 +1,8 @@
-const stream = require('stream')
-const http = require('http')
+const stream = require('node:stream')
+const http = require('node:http')
 
 const chai = require('chai')
-const { Blob } = require('buffer')
+const { Blob } = require('node:buffer')
 
 const Request = require('../../lib/fetch/request.js').Request
 const TestServer = require('./utils/server.js')
diff --git a/test/node-fetch/response.js b/test/node-fetch/response.js
index 4bb7c423208..b928651edfa 100644
--- a/test/node-fetch/response.js
+++ b/test/node-fetch/response.js
@@ -1,10 +1,10 @@
 /* eslint no-unused-expressions: "off" */
 
 const chai = require('chai')
-const stream = require('stream')
+const stream = require('node:stream')
 const { Response } = require('../../lib/fetch/response.js')
 const TestServer = require('./utils/server.js')
-const { Blob } = require('buffer')
+const { Blob } = require('node:buffer')
 const { kState } = require('../../lib/fetch/symbols.js')
 
 const { expect } = chai
diff --git a/test/node-fetch/utils/server.js b/test/node-fetch/utils/server.js
index 46dc9834fca..548f351a88a 100644
--- a/test/node-fetch/utils/server.js
+++ b/test/node-fetch/utils/server.js
@@ -1,6 +1,6 @@
-const http = require('http')
-const zlib = require('zlib')
-const { once } = require('events')
+const http = require('node:http')
+const zlib = require('node:zlib')
+const { once } = require('node:events')
 const Busboy = require('@fastify/busboy')
 
 module.exports = class TestServer {
diff --git a/test/node-test/abort-controller.js b/test/node-test/abort-controller.js
index 3096e5eba4e..b71ffa7abf7 100644
--- a/test/node-test/abort-controller.js
+++ b/test/node-test/abort-controller.js
@@ -3,8 +3,8 @@
 const { test } = require('node:test')
 const { AbortController: NPMAbortController } = require('abort-controller')
 const { Client, errors } = require('../..')
-const { createServer } = require('http')
-const { createReadStream } = require('fs')
+const { createServer } = require('node:http')
+const { createReadStream } = require('node:fs')
 const { wrapWithAsyncIterable } = require('../utils/async-iterators')
 const { tspl } = require('@matteo.collina/tspl')
 const { closeServerAsPromise } = require('../utils/node-http')
diff --git a/test/node-test/abort-event-emitter.js b/test/node-test/abort-event-emitter.js
index 72a009a041e..ad7231331cb 100644
--- a/test/node-test/abort-event-emitter.js
+++ b/test/node-test/abort-event-emitter.js
@@ -1,11 +1,11 @@
 'use strict'
 
 const { test } = require('node:test')
-const EventEmitter = require('events')
+const EventEmitter = require('node:events')
 const { Client, errors } = require('../..')
-const { createServer } = require('http')
-const { createReadStream } = require('fs')
-const { Readable } = require('stream')
+const { createServer } = require('node:http')
+const { createReadStream } = require('node:fs')
+const { Readable } = require('node:stream')
 const { tspl } = require('@matteo.collina/tspl')
 const { wrapWithAsyncIterable } = require('../utils/async-iterators')
 const { closeServerAsPromise } = require('../utils/node-http')
diff --git a/test/node-test/agent.js b/test/node-test/agent.js
index 6ec2156178e..c077fbab4e8 100644
--- a/test/node-test/agent.js
+++ b/test/node-test/agent.js
@@ -2,8 +2,8 @@
 
 const { describe, test, after } = require('node:test')
 const assert = require('node:assert/strict')
-const http = require('http')
-const { PassThrough } = require('stream')
+const http = require('node:http')
+const { PassThrough } = require('node:stream')
 const { kRunning } = require('../../lib/core/symbols')
 const {
   Agent,
diff --git a/test/node-test/async_hooks.js b/test/node-test/async_hooks.js
index e670179fec6..4814addde8d 100644
--- a/test/node-test/async_hooks.js
+++ b/test/node-test/async_hooks.js
@@ -2,10 +2,10 @@
 
 const { test } = require('node:test')
 const { Client } = require('../..')
-const { createServer } = require('http')
-const { createHook, executionAsyncId } = require('async_hooks')
-const { readFile } = require('fs')
-const { PassThrough } = require('stream')
+const { createServer } = require('node:http')
+const { createHook, executionAsyncId } = require('node:async_hooks')
+const { readFile } = require('node:fs')
+const { PassThrough } = require('node:stream')
 const { tspl } = require('@matteo.collina/tspl')
 const { closeServerAsPromise } = require('../utils/node-http')
 
diff --git a/test/node-test/autoselectfamily.js b/test/node-test/autoselectfamily.js
index 67dea1af995..678a8959042 100644
--- a/test/node-test/autoselectfamily.js
+++ b/test/node-test/autoselectfamily.js
@@ -1,10 +1,10 @@
 'use strict'
 
 const { test, skip } = require('node:test')
-const dgram = require('dgram')
-const { Resolver } = require('dns')
+const dgram = require('node:dgram')
+const { Resolver } = require('node:dns')
 const dnsPacket = require('dns-packet')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const { Client, Agent, request } = require('../..')
 const { nodeHasAutoSelectFamily } = require('../../lib/core/util')
 const { tspl } = require('@matteo.collina/tspl')
diff --git a/test/node-test/balanced-pool.js b/test/node-test/balanced-pool.js
index a47c71c4b6f..564f23979b7 100644
--- a/test/node-test/balanced-pool.js
+++ b/test/node-test/balanced-pool.js
@@ -4,8 +4,8 @@ const { describe, test } = require('node:test')
 const assert = require('node:assert/strict')
 const { BalancedPool, Pool, Client, errors } = require('../..')
 const { nodeMajor } = require('../../lib/core/util')
-const { createServer } = require('http')
-const { promisify } = require('util')
+const { createServer } = require('node:http')
+const { promisify } = require('node:util')
 const { tspl } = require('@matteo.collina/tspl')
 
 test('throws when factory is not a function', (t) => {
diff --git a/test/node-test/ca-fingerprint.js b/test/node-test/ca-fingerprint.js
index b7fe64eb766..bad8aeff555 100644
--- a/test/node-test/ca-fingerprint.js
+++ b/test/node-test/ca-fingerprint.js
@@ -1,7 +1,7 @@
 'use strict'
 
-const crypto = require('crypto')
-const https = require('https')
+const crypto = require('node:crypto')
+const https = require('node:https')
 const { test } = require('node:test')
 const { Client, buildConnector } = require('../..')
 const pem = require('https-pem')
diff --git a/test/node-test/client-abort.js b/test/node-test/client-abort.js
index ebc4fce009b..a5337f16ae2 100644
--- a/test/node-test/client-abort.js
+++ b/test/node-test/client-abort.js
@@ -2,8 +2,8 @@
 
 const { test } = require('node:test')
 const { Client, errors } = require('../..')
-const { createServer } = require('http')
-const { Readable } = require('stream')
+const { createServer } = require('node:http')
+const { Readable } = require('node:stream')
 const { tspl } = require('@matteo.collina/tspl')
 
 class OnAbortError extends Error {}
diff --git a/test/node-test/client-connect.js b/test/node-test/client-connect.js
index 7de9d2e39e3..0bf65488d81 100644
--- a/test/node-test/client-connect.js
+++ b/test/node-test/client-connect.js
@@ -2,8 +2,8 @@
 
 const { test } = require('node:test')
 const { Client, errors } = require('../..')
-const http = require('http')
-const EE = require('events')
+const http = require('node:http')
+const EE = require('node:events')
 const { kBusy } = require('../../lib/core/symbols')
 const { tspl } = require('@matteo.collina/tspl')
 const { closeServerAsPromise } = require('../utils/node-http')
diff --git a/test/node-test/client-dispatch.js b/test/node-test/client-dispatch.js
index 42fbf91b412..b89bad7278b 100644
--- a/test/node-test/client-dispatch.js
+++ b/test/node-test/client-dispatch.js
@@ -2,9 +2,9 @@
 
 const { test } = require('node:test')
 const assert = require('node:assert/strict')
-const http = require('http')
+const http = require('node:http')
 const { Client, Pool, errors } = require('../..')
-const stream = require('stream')
+const stream = require('node:stream')
 const { createSecureServer } = require('node:http2')
 const pem = require('https-pem')
 const { tspl } = require('@matteo.collina/tspl')
diff --git a/test/node-test/client-errors.js b/test/node-test/client-errors.js
index 72ae7c7a0fd..41389088425 100644
--- a/test/node-test/client-errors.js
+++ b/test/node-test/client-errors.js
@@ -3,10 +3,10 @@
 const { test } = require('node:test')
 const assert = require('node:assert')
 const { Client, Pool, errors } = require('../..')
-const { createServer } = require('http')
-const https = require('https')
+const { createServer } = require('node:http')
+const https = require('node:https')
 const pem = require('https-pem')
-const { Readable } = require('stream')
+const { Readable } = require('node:stream')
 const { tspl } = require('@matteo.collina/tspl')
 
 const { kSocket } = require('../../lib/core/symbols')
diff --git a/test/node-test/diagnostics-channel/connect-error.js b/test/node-test/diagnostics-channel/connect-error.js
index 1cc255c8d46..ecab3856b89 100644
--- a/test/node-test/diagnostics-channel/connect-error.js
+++ b/test/node-test/diagnostics-channel/connect-error.js
@@ -6,7 +6,7 @@ const { tspl } = require('@matteo.collina/tspl')
 let diagnosticsChannel
 
 try {
-  diagnosticsChannel = require('diagnostics_channel')
+  diagnosticsChannel = require('node:diagnostics_channel')
 } catch {
   skip('missing diagnostics_channel')
   process.exit(0)
diff --git a/test/node-test/diagnostics-channel/error.js b/test/node-test/diagnostics-channel/error.js
index 9b320b59824..b4861b8f71c 100644
--- a/test/node-test/diagnostics-channel/error.js
+++ b/test/node-test/diagnostics-channel/error.js
@@ -6,14 +6,14 @@ const { tspl } = require('@matteo.collina/tspl')
 let diagnosticsChannel
 
 try {
-  diagnosticsChannel = require('diagnostics_channel')
+  diagnosticsChannel = require('node:diagnostics_channel')
 } catch {
   skip('missing diagnostics_channel')
   process.exit(0)
 }
 
 const { Client } = require('../../..')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 
 test('Diagnostics channel - error', (t) => {
   const assert = tspl(t, { plan: 3 })
diff --git a/test/node-test/diagnostics-channel/get.js b/test/node-test/diagnostics-channel/get.js
index a41df9d2563..cde68a46f2c 100644
--- a/test/node-test/diagnostics-channel/get.js
+++ b/test/node-test/diagnostics-channel/get.js
@@ -6,14 +6,14 @@ const { tspl } = require('@matteo.collina/tspl')
 let diagnosticsChannel
 
 try {
-  diagnosticsChannel = require('diagnostics_channel')
+  diagnosticsChannel = require('node:diagnostics_channel')
 } catch {
   skip('missing diagnostics_channel')
   process.exit(0)
 }
 
 const { Client } = require('../../..')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 
 test('Diagnostics channel - get', (t) => {
   const assert = tspl(t, { plan: 32 })
diff --git a/test/node-test/diagnostics-channel/post-stream.js b/test/node-test/diagnostics-channel/post-stream.js
index aa2792a2732..a50d5ea02c0 100644
--- a/test/node-test/diagnostics-channel/post-stream.js
+++ b/test/node-test/diagnostics-channel/post-stream.js
@@ -2,19 +2,19 @@
 
 const { test, skip, after } = require('node:test')
 const { tspl } = require('@matteo.collina/tspl')
-const { Readable } = require('stream')
+const { Readable } = require('node:stream')
 
 let diagnosticsChannel
 
 try {
-  diagnosticsChannel = require('diagnostics_channel')
+  diagnosticsChannel = require('node:diagnostics_channel')
 } catch {
   skip('missing diagnostics_channel')
   process.exit(0)
 }
 
 const { Client } = require('../../..')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 
 test('Diagnostics channel - post stream', (t) => {
   const assert = tspl(t, { plan: 33 })
diff --git a/test/node-test/diagnostics-channel/post.js b/test/node-test/diagnostics-channel/post.js
index 427853b66ea..45368e3fdab 100644
--- a/test/node-test/diagnostics-channel/post.js
+++ b/test/node-test/diagnostics-channel/post.js
@@ -6,14 +6,14 @@ const { tspl } = require('@matteo.collina/tspl')
 let diagnosticsChannel
 
 try {
-  diagnosticsChannel = require('diagnostics_channel')
+  diagnosticsChannel = require('node:diagnostics_channel')
 } catch {
   skip('missing diagnostics_channel')
   process.exit(0)
 }
 
 const { Client } = require('../../../')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 
 test('Diagnostics channel - post', (t) => {
   const assert = tspl(t, { plan: 33 })
diff --git a/test/node-test/large-body.js b/test/node-test/large-body.js
index 4fbe5b7a9b7..8707fe04d03 100644
--- a/test/node-test/large-body.js
+++ b/test/node-test/large-body.js
@@ -1,7 +1,7 @@
 'use strict'
 
 const { test } = require('node:test')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const { request } = require('../../')
 const { strictEqual } = require('node:assert')
 
diff --git a/test/node-test/unix.js b/test/node-test/unix.js
index 3e2032e500b..629ea883115 100644
--- a/test/node-test/unix.js
+++ b/test/node-test/unix.js
@@ -2,10 +2,10 @@
 
 const { test } = require('node:test')
 const { Client, Pool } = require('../../')
-const http = require('http')
-const https = require('https')
+const http = require('node:http')
+const https = require('node:https')
 const pem = require('https-pem')
-const fs = require('fs')
+const fs = require('node:fs')
 const { tspl } = require('@matteo.collina/tspl')
 
 if (process.platform !== 'win32') {
diff --git a/test/node-test/util.js b/test/node-test/util.js
index d3305126cec..9d18f98d596 100644
--- a/test/node-test/util.js
+++ b/test/node-test/util.js
@@ -2,8 +2,8 @@
 
 const { test } = require('node:test')
 const assert = require('node:assert')
-const { Stream } = require('stream')
-const { EventEmitter } = require('events')
+const { Stream } = require('node:stream')
+const { EventEmitter } = require('node:events')
 
 const util = require('../../lib/core/util')
 const { headerNameLowerCasedRecord } = require('../../lib/core/constants')
diff --git a/test/node-test/validations.js b/test/node-test/validations.js
index 99e3f505bde..f23f910ed21 100644
--- a/test/node-test/validations.js
+++ b/test/node-test/validations.js
@@ -1,7 +1,7 @@
 'use strict'
 
 const { test } = require('node:test')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const { Client } = require('../../')
 const { tspl } = require('@matteo.collina/tspl')
 
diff --git a/test/parser-issues.js b/test/parser-issues.js
index b98edf159ef..c94e8cf04bc 100644
--- a/test/parser-issues.js
+++ b/test/parser-issues.js
@@ -1,4 +1,4 @@
-const net = require('net')
+const net = require('node:net')
 const { test } = require('tap')
 const { Client, errors } = require('..')
 
diff --git a/test/pipeline-pipelining.js b/test/pipeline-pipelining.js
index 52a29d799b2..4a94e38375f 100644
--- a/test/pipeline-pipelining.js
+++ b/test/pipeline-pipelining.js
@@ -2,7 +2,7 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const { kConnect } = require('../lib/core/symbols')
 const { kBusy, kPending, kRunning } = require('../lib/core/symbols')
 
diff --git a/test/pool.js b/test/pool.js
index 816bc5e2d31..0d586655b9f 100644
--- a/test/pool.js
+++ b/test/pool.js
@@ -1,14 +1,14 @@
 'use strict'
 
-const { EventEmitter } = require('events')
-const { createServer } = require('http')
-const net = require('net')
+const { EventEmitter } = require('node:events')
+const { createServer } = require('node:http')
+const net = require('node:net')
 const {
   finished,
   PassThrough,
   Readable
-} = require('stream')
-const { promisify } = require('util')
+} = require('node:stream')
+const { promisify } = require('node:util')
 const proxyquire = require('proxyquire')
 const { test } = require('tap')
 const {
diff --git a/test/promises.js b/test/promises.js
index 524fdfc8178..4188a125bd9 100644
--- a/test/promises.js
+++ b/test/promises.js
@@ -2,8 +2,8 @@
 
 const { test } = require('tap')
 const { Client, Pool } = require('..')
-const { createServer } = require('http')
-const { readFileSync, createReadStream } = require('fs')
+const { createServer } = require('node:http')
+const { readFileSync, createReadStream } = require('node:fs')
 const { wrapWithAsyncIterable } = require('./utils/async-iterators')
 
 test('basic get, async await support', (t) => {
diff --git a/test/proxy-agent.js b/test/proxy-agent.js
index 42332389793..806f02a2d55 100644
--- a/test/proxy-agent.js
+++ b/test/proxy-agent.js
@@ -3,12 +3,12 @@
 const { test, teardown } = require('tap')
 const { request, fetch, setGlobalDispatcher, getGlobalDispatcher } = require('..')
 const { InvalidArgumentError } = require('../lib/core/errors')
-const { readFileSync } = require('fs')
-const { join } = require('path')
+const { readFileSync } = require('node:fs')
+const { join } = require('node:path')
 const ProxyAgent = require('../lib/proxy-agent')
 const Pool = require('../lib/pool')
-const { createServer } = require('http')
-const https = require('https')
+const { createServer } = require('node:http')
+const https = require('node:https')
 const proxy = require('proxy')
 
 test('should throw error when no uri is provided', (t) => {
diff --git a/test/proxy.js b/test/proxy.js
index d6d8d42f17d..c910d7224d1 100644
--- a/test/proxy.js
+++ b/test/proxy.js
@@ -2,7 +2,7 @@
 
 const { test } = require('tap')
 const { Client, Pool } = require('..')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const proxy = require('proxy')
 
 test('connect through proxy', async (t) => {
diff --git a/test/redirect-pipeline.js b/test/redirect-pipeline.js
index e4be837c6e9..d958ee513f1 100644
--- a/test/redirect-pipeline.js
+++ b/test/redirect-pipeline.js
@@ -2,8 +2,8 @@
 
 const t = require('tap')
 const { pipeline: undiciPipeline } = require('..')
-const { pipeline: streamPipelineCb } = require('stream')
-const { promisify } = require('util')
+const { pipeline: streamPipelineCb } = require('node:stream')
+const { promisify } = require('node:util')
 const { createReadable, createWritable } = require('./utils/stream')
 const { startRedirectingServer } = require('./utils/redirecting-servers')
 
diff --git a/test/request-crlf.js b/test/request-crlf.js
index abcecf091f5..f3572062491 100644
--- a/test/request-crlf.js
+++ b/test/request-crlf.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const { test } = require('tap')
 const { request, errors } = require('..')
 
diff --git a/test/request-timeout.js b/test/request-timeout.js
index 6ac19735394..49d29a6223c 100644
--- a/test/request-timeout.js
+++ b/test/request-timeout.js
@@ -1,12 +1,12 @@
 'use strict'
 
 const { test } = require('tap')
-const { createReadStream, writeFileSync, unlinkSync } = require('fs')
+const { createReadStream, writeFileSync, unlinkSync } = require('node:fs')
 const { Client, errors } = require('..')
 const { kConnect } = require('../lib/core/symbols')
 const timers = require('../lib/timers')
-const { createServer } = require('http')
-const EventEmitter = require('events')
+const { createServer } = require('node:http')
+const EventEmitter = require('node:events')
 const FakeTimers = require('@sinonjs/fake-timers')
 const { AbortController } = require('abort-controller')
 const {
@@ -14,7 +14,7 @@ const {
   Readable,
   Writable,
   PassThrough
-} = require('stream')
+} = require('node:stream')
 
 test('request timeout', (t) => {
   t.plan(1)
diff --git a/test/request-timeout2.js b/test/request-timeout2.js
index 53943fbf5d3..ff4f1ddfebc 100644
--- a/test/request-timeout2.js
+++ b/test/request-timeout2.js
@@ -2,8 +2,8 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const { createServer } = require('http')
-const { Readable } = require('stream')
+const { createServer } = require('node:http')
+const { Readable } = require('node:stream')
 
 test('request timeout with slow readable body', (t) => {
   t.plan(1)
diff --git a/test/request.js b/test/request.js
index d3a2f7484b1..30bf745c3f1 100644
--- a/test/request.js
+++ b/test/request.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const { test } = require('tap')
 const { request } = require('..')
 
diff --git a/test/socket-back-pressure.js b/test/socket-back-pressure.js
index 9e774b3de6a..325ac993933 100644
--- a/test/socket-back-pressure.js
+++ b/test/socket-back-pressure.js
@@ -1,8 +1,8 @@
 'use strict'
 
 const { Client } = require('..')
-const { createServer } = require('http')
-const { Readable } = require('stream')
+const { createServer } = require('node:http')
+const { Readable } = require('node:stream')
 const { test } = require('tap')
 
 test('socket back-pressure', (t) => {
diff --git a/test/socket-timeout.js b/test/socket-timeout.js
index 8019c74198a..eb9670c6020 100644
--- a/test/socket-timeout.js
+++ b/test/socket-timeout.js
@@ -3,7 +3,7 @@
 const { test } = require('tap')
 const { Client, errors } = require('..')
 const timers = require('../lib/timers')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const FakeTimers = require('@sinonjs/fake-timers')
 
 test('timeout with pipelining 1', (t) => {
diff --git a/test/stream-compat.js b/test/stream-compat.js
index 71d2410ee36..02d521a9d65 100644
--- a/test/stream-compat.js
+++ b/test/stream-compat.js
@@ -2,9 +2,9 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const { createServer } = require('http')
-const { Readable } = require('stream')
-const EE = require('events')
+const { createServer } = require('node:http')
+const { Readable } = require('node:stream')
+const EE = require('node:events')
 
 test('stream body without destroy', (t) => {
   t.plan(2)
diff --git a/test/tls-session-reuse.js b/test/tls-session-reuse.js
index 7a7657b4e4c..ae65571bfa2 100644
--- a/test/tls-session-reuse.js
+++ b/test/tls-session-reuse.js
@@ -1,9 +1,9 @@
 'use strict'
 
-const { readFileSync } = require('fs')
-const { join } = require('path')
-const https = require('https')
-const crypto = require('crypto')
+const { readFileSync } = require('node:fs')
+const { join } = require('node:path')
+const https = require('node:https')
+const crypto = require('node:crypto')
 const { test, teardown } = require('tap')
 const { Client, Pool } = require('..')
 const { kSocket } = require('../lib/core/symbols')
diff --git a/test/tls.js b/test/tls.js
index fbe07b09beb..cd4660fa319 100644
--- a/test/tls.js
+++ b/test/tls.js
@@ -5,7 +5,7 @@
 // const { test } = require('tap')
 // const { Client } = require('..')
 // const { kSocket } = require('../lib/core/symbols')
-// const { Readable } = require('stream')
+// const { Readable } = require('node:stream')
 // const { kRunning } = require('../lib/core/symbols')
 
 // test('tls get 1', (t) => {
diff --git a/test/trailers.js b/test/trailers.js
index ca56de23cc5..e56542568ab 100644
--- a/test/trailers.js
+++ b/test/trailers.js
@@ -2,7 +2,7 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 
 test('response trailers missing is OK', (t) => {
   t.plan(1)
diff --git a/test/utils/redirecting-servers.js b/test/utils/redirecting-servers.js
index ad8aa583fdb..0125fc55748 100644
--- a/test/utils/redirecting-servers.js
+++ b/test/utils/redirecting-servers.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 
 const isNode20 = process.version.startsWith('v20.')
 
diff --git a/test/utils/stream.js b/test/utils/stream.js
index e35ca29fe44..9c35d9fa9d4 100644
--- a/test/utils/stream.js
+++ b/test/utils/stream.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const { Readable, Writable } = require('stream')
+const { Readable, Writable } = require('node:stream')
 
 function createReadable (data) {
   return new Readable({
diff --git a/test/websocket/custom-headers.js b/test/websocket/custom-headers.js
index 11611a84c0a..ebe3ae541ab 100644
--- a/test/websocket/custom-headers.js
+++ b/test/websocket/custom-headers.js
@@ -1,7 +1,7 @@
 'use strict'
 
 const { test } = require('node:test')
-const assert = require('assert')
+const assert = require('node:assert')
 const { Agent, WebSocket } = require('../..')
 
 test('Setting custom headers', (t) => {
diff --git a/test/websocket/diagnostics-channel.js b/test/websocket/diagnostics-channel.js
index fbd75ceca8c..b11a06e6ea9 100644
--- a/test/websocket/diagnostics-channel.js
+++ b/test/websocket/diagnostics-channel.js
@@ -2,7 +2,7 @@
 
 const { describe, test } = require('node:test')
 const assert = require('node:assert')
-const dc = require('diagnostics_channel')
+const dc = require('node:diagnostics_channel')
 const { WebSocketServer } = require('ws')
 const { WebSocket } = require('../..')
 
diff --git a/test/websocket/fragments.js b/test/websocket/fragments.js
index 3c798302f80..a4a168fe7cb 100644
--- a/test/websocket/fragments.js
+++ b/test/websocket/fragments.js
@@ -4,7 +4,7 @@ const assert = require('node:assert')
 const { test, after } = require('node:test')
 const { WebSocketServer } = require('ws')
 const { WebSocket } = require('../..')
-const diagnosticsChannel = require('diagnostics_channel')
+const diagnosticsChannel = require('node:diagnostics_channel')
 
 test('Fragmented frame with a ping frame in the middle of it', () => {
   const server = new WebSocketServer({ port: 0 })
diff --git a/test/websocket/opening-handshake.js b/test/websocket/opening-handshake.js
index 4dce496e829..110a827edc9 100644
--- a/test/websocket/opening-handshake.js
+++ b/test/websocket/opening-handshake.js
@@ -2,7 +2,7 @@
 
 const { test } = require('node:test')
 const assert = require('node:assert')
-const { createServer } = require('http')
+const { createServer } = require('node:http')
 const { WebSocketServer } = require('ws')
 const { WebSocket } = require('../..')
 
@@ -155,7 +155,7 @@ test('Server sends invalid Sec-WebSocket-Accept header', () => {
 test('Server sends invalid Sec-WebSocket-Extensions header', () => {
   return new Promise((resolve, reject) => {
     const uid = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11'
-    const { createHash } = require('crypto')
+    const { createHash } = require('node:crypto')
 
     const server = createServer((req, res) => {
       const key = req.headers['sec-websocket-key']
@@ -186,7 +186,7 @@ test('Server sends invalid Sec-WebSocket-Extensions header', () => {
 
 test('Server sends invalid Sec-WebSocket-Extensions header', () => {
   const uid = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11'
-  const { createHash } = require('crypto')
+  const { createHash } = require('node:crypto')
 
   return new Promise((resolve, reject) => {
     const server = createServer((req, res) => {
diff --git a/test/websocket/ping-pong.js b/test/websocket/ping-pong.js
index 81ae3a478ec..0a30f239a6d 100644
--- a/test/websocket/ping-pong.js
+++ b/test/websocket/ping-pong.js
@@ -3,7 +3,7 @@
 const { test } = require('node:test')
 const assert = require('node:assert')
 const { WebSocketServer } = require('ws')
-const diagnosticsChannel = require('diagnostics_channel')
+const diagnosticsChannel = require('node:diagnostics_channel')
 const { WebSocket } = require('../..')
 
 test('Receives ping and parses body', () => {
diff --git a/test/websocket/send.js b/test/websocket/send.js
index bd49ce95766..b2b153829da 100644
--- a/test/websocket/send.js
+++ b/test/websocket/send.js
@@ -3,7 +3,7 @@
 const { test, describe } = require('node:test')
 const assert = require('node:assert')
 const { WebSocketServer } = require('ws')
-const { Blob } = require('buffer')
+const { Blob } = require('node:buffer')
 const { WebSocket } = require('../..')
 
 // the following three tests exercise different code paths because of the three