diff --git a/.github/ISSUE_TEMPLATE/bug.yaml b/.github/ISSUE_TEMPLATE/bug.yaml
index 75678124cb4..cb2cefd937e 100644
--- a/.github/ISSUE_TEMPLATE/bug.yaml
+++ b/.github/ISSUE_TEMPLATE/bug.yaml
@@ -53,7 +53,7 @@ body:
     id: system-info
     attributes:
       label: System Info
-      description: Output of `npx envinfo --system --npmPackages '{vite,undici,typescript,@builder.io/*}' --binaries --browsers`
+      description: Output of `npx envinfo --system --npmPackages '{vite,typescript,@builder.io/*}' --binaries --browsers`
       render: shell
       placeholder: System, Binaries, Browsers
     validations:
diff --git a/package.json b/package.json
index 76398c6babb..60bc6479142 100644
--- a/package.json
+++ b/package.json
@@ -29,15 +29,6 @@
           ],
           "pinVersion": "1.40.0"
         }
-      ],
-      "semverGroups": [
-        {
-          "label": "Undici should always be * until we remove it",
-          "range": "*",
-          "dependencies": [
-            "undici"
-          ]
-        }
       ]
     }
   },
@@ -123,7 +114,6 @@
     "terser": "^5.31.0",
     "tsm": "^2.3.0",
     "typescript": "5.4.5",
-    "undici": "*",
     "vfile": "^6.0.1",
     "vite": "^5.2.11",
     "vite-imagetools": "^6.2.9",
@@ -135,7 +125,7 @@
     "zod": "^3.23.8"
   },
   "engines": {
-    "node": ">=16.8.0 <18.0.0 || >=18.11",
+    "node": "^18.17.0 || ^20.3.0 || >=21.0.0",
     "npm": "please-use-pnpm",
     "yarn": "please-use-pnpm",
     "pnpm": ">=9.0.5"
diff --git a/packages/docs/contributors.ts b/packages/docs/contributors.ts
index 0550f4b40d7..22877e9bcfa 100644
--- a/packages/docs/contributors.ts
+++ b/packages/docs/contributors.ts
@@ -1,5 +1,4 @@
 /* eslint-disable no-console */
-import { fetch } from 'undici';
 import fs from 'node:fs';
 import path from 'node:path';
 import url from 'node:url';
diff --git a/packages/docs/package.json b/packages/docs/package.json
index 7b97896fb02..fd750c2e5a2 100644
--- a/packages/docs/package.json
+++ b/packages/docs/package.json
@@ -43,14 +43,13 @@
     "terser": "^5.31.0",
     "tsm": "^2.3.0",
     "typescript": "5.4.5",
-    "undici": "*",
     "valibot": "^0.29.0",
     "vite": "^5.2.11",
     "vite-plugin-inspect": "^0.8.4",
     "wrangler": "^3.53.1"
   },
   "engines": {
-    "node": ">=18.11",
+    "node": "^18.17.0 || ^20.3.0 || >=21.0.0",
     "npm": "please-use-pnpm",
     "yarn": "please-use-pnpm",
     "pnpm": ">=8.6.12"
diff --git a/packages/docs/scripts/showcase.js b/packages/docs/scripts/showcase.js
index 74064e92901..9eaea2e4887 100644
--- a/packages/docs/scripts/showcase.js
+++ b/packages/docs/scripts/showcase.js
@@ -134,7 +134,6 @@ async function captureMultipleScreenshots() {
 }
 
 async function getPagespeedData(url) {
-  const { fetch } = await import('undici');
   const requestURL = `https://www.googleapis.com/pagespeedonline/v5/runPagespeed?url=${encodeURIComponent(
     url
   )}&key=AIzaSyApBC9gblaCzWrtEBgHnZkd_B37OF49BfM&category=PERFORMANCE&strategy=MOBILE`;
diff --git a/packages/eslint-plugin-qwik/package.json b/packages/eslint-plugin-qwik/package.json
index 89eb597d917..5bb95f09d20 100644
--- a/packages/eslint-plugin-qwik/package.json
+++ b/packages/eslint-plugin-qwik/package.json
@@ -17,7 +17,7 @@
     "redent": "^4.0.0"
   },
   "engines": {
-    "node": ">=16.8.0 <18.0.0 || >=18.11"
+    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
   },
   "homepage": "https://github.com/QwikDev/qwik#readme",
   "keywords": [
diff --git a/packages/insights/package.json b/packages/insights/package.json
index 8b0165dd359..95d51542c0c 100644
--- a/packages/insights/package.json
+++ b/packages/insights/package.json
@@ -35,13 +35,12 @@
     "prettier-plugin-tailwindcss": "^0.5.14",
     "tailwindcss": "^3.4.3",
     "typescript": "5.4.5",
-    "undici": "*",
     "vite": "^5.2.11",
     "vite-tsconfig-paths": "^4.3.2",
     "vitest": "^1.6.0"
   },
   "engines": {
-    "node": ">=16.8.0 <18.0.0 || >=18.11"
+    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
   },
   "private": true,
   "scripts": {
diff --git a/packages/qwik-auth/package.json b/packages/qwik-auth/package.json
index ae967b2b9cd..42c0cf06cfb 100644
--- a/packages/qwik-auth/package.json
+++ b/packages/qwik-auth/package.json
@@ -14,7 +14,7 @@
     "set-cookie-parser": "^2.6.0"
   },
   "engines": {
-    "node": ">=16.8.0 <18.0.0 || >=18.11"
+    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
   },
   "exports": {
     ".": {
diff --git a/packages/qwik-city/buildtime/vite/plugin.ts b/packages/qwik-city/buildtime/vite/plugin.ts
index 2dd8a9a5352..775ffd07190 100644
--- a/packages/qwik-city/buildtime/vite/plugin.ts
+++ b/packages/qwik-city/buildtime/vite/plugin.ts
@@ -13,7 +13,6 @@ import { build } from '../build';
 import { ssrDevMiddleware, staticDistMiddleware } from './dev-server';
 import { transformMenu } from '../markdown/menu';
 import { generateQwikCityEntries } from '../runtime-generation/generate-entries';
-import { patchGlobalThis } from '../../middleware/node/node-fetch';
 import type { QwikVitePlugin } from '@builder.io/qwik/optimizer';
 import fs from 'node:fs';
 import {
@@ -42,9 +41,6 @@ function qwikCityPlugin(userOpts?: QwikCityVitePluginOptions): any {
   let ssrFormat: 'esm' | 'cjs' = 'esm';
   let outDir: string | null = null;
 
-  // Patch Stream APIs
-  patchGlobalThis();
-
   globalThis.__qwikCityNew = true;
 
   const api: QwikCityPluginApi = {
diff --git a/packages/qwik-city/middleware/node/index.ts b/packages/qwik-city/middleware/node/index.ts
index 1e53e714d31..0461cf43ff9 100644
--- a/packages/qwik-city/middleware/node/index.ts
+++ b/packages/qwik-city/middleware/node/index.ts
@@ -12,7 +12,6 @@ import { extname, join, basename } from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { computeOrigin, fromNodeHttp, getUrl } from './http';
 import { MIME_TYPES } from '../request-handler/mime-types';
-import { patchGlobalThis } from './node-fetch';
 import { _deserializeData, _serializeData, _verifySerializable } from '@builder.io/qwik';
 import type { Http2ServerRequest } from 'node:http2';
 
@@ -20,9 +19,6 @@ import type { Http2ServerRequest } from 'node:http2';
 
 /** @public */
 export function createQwikCity(opts: QwikCityNodeRequestOptions) {
-  // Patch Stream APIs
-  patchGlobalThis();
-
   const qwikSerializer = {
     _deserializeData,
     _serializeData,
diff --git a/packages/qwik-city/middleware/node/node-fetch.ts b/packages/qwik-city/middleware/node/node-fetch.ts
deleted file mode 100644
index 328a1b6002e..00000000000
--- a/packages/qwik-city/middleware/node/node-fetch.ts
+++ /dev/null
@@ -1,38 +0,0 @@
-import {
-  TextEncoderStream,
-  TextDecoderStream,
-  WritableStream,
-  ReadableStream,
-} from 'node:stream/web';
-import { fetch, Headers, Request, Response, FormData } from 'undici';
-
-import crypto from 'crypto';
-
-// TODO: remove when undici is removed
-export function patchGlobalThis() {
-  if (
-    typeof global !== 'undefined' &&
-    typeof globalThis.fetch !== 'function' &&
-    typeof process !== 'undefined' &&
-    process.versions.node
-  ) {
-    globalThis.fetch = fetch as any;
-    globalThis.Headers = Headers as any;
-    globalThis.Request = Request as any;
-    globalThis.Response = Response as any;
-    globalThis.FormData = FormData as any;
-  }
-  if (typeof globalThis.TextEncoderStream === 'undefined') {
-    // @ts-ignore
-    globalThis.TextEncoderStream = TextEncoderStream;
-    // @ts-ignore
-    globalThis.TextDecoderStream = TextDecoderStream;
-  }
-  if (typeof globalThis.WritableStream === 'undefined') {
-    globalThis.WritableStream = WritableStream as any;
-    globalThis.ReadableStream = ReadableStream as any;
-  }
-  if (typeof globalThis.crypto === 'undefined') {
-    globalThis.crypto = crypto.webcrypto as any;
-  }
-}
diff --git a/packages/qwik-city/package.json b/packages/qwik-city/package.json
index 0b34fc73234..e0090dfd79c 100644
--- a/packages/qwik-city/package.json
+++ b/packages/qwik-city/package.json
@@ -8,7 +8,6 @@
     "@types/mdx": "^2.0.13",
     "source-map": "0.7.4",
     "svgo": "^3.2.0",
-    "undici": "*",
     "vfile": "^6.0.1",
     "vite": "^5.2.11",
     "vite-imagetools": "^6.2.9",
@@ -43,7 +42,7 @@
     "yaml": "^2.4.2"
   },
   "engines": {
-    "node": ">=16.8.0 <18.0.0 || >=18.11"
+    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
   },
   "exports": {
     ".": {
diff --git a/packages/qwik-city/runtime/src/service-worker/utils.unit.ts b/packages/qwik-city/runtime/src/service-worker/utils.unit.ts
index 5e2b14000ee..565cf9c0337 100644
--- a/packages/qwik-city/runtime/src/service-worker/utils.unit.ts
+++ b/packages/qwik-city/runtime/src/service-worker/utils.unit.ts
@@ -1,4 +1,3 @@
-import { Request as NodeRequest, Response as NodeResponse } from 'undici';
 import type { AppBundle } from './types';
 import { getCacheToDelete, isAppBundleRequest, useCache } from './utils';
 import { assert, test } from 'vitest';
@@ -75,9 +74,9 @@ test('useCache', () => {
 
 export function mockRequest(url?: string): Request {
   url = url || 'https://qwik.dev/';
-  return new NodeRequest(url) as any;
+  return new Request(url);
 }
 
 export function mockResponse(body?: any): Response {
-  return new NodeResponse(body) as any;
+  return new Response(body);
 }
diff --git a/packages/qwik-city/static/node/index.ts b/packages/qwik-city/static/node/index.ts
index 337cf468980..4f31e3ab603 100644
--- a/packages/qwik-city/static/node/index.ts
+++ b/packages/qwik-city/static/node/index.ts
@@ -3,7 +3,6 @@ import { createSystem } from './node-system';
 import { isMainThread, workerData } from 'node:worker_threads';
 import { mainThread } from '../main-thread';
 import { workerThread } from '../worker-thread';
-import { patchGlobalThis } from 'packages/qwik-city/middleware/node/node-fetch';
 
 export async function generate(opts: StaticGenerateOptions) {
   if (isMainThread) {
@@ -17,8 +16,6 @@ export async function generate(opts: StaticGenerateOptions) {
 
 if (!isMainThread && workerData) {
   (async () => {
-    patchGlobalThis();
-
     // self initializing worker thread with workerData
     const sys = await createSystem(workerData);
     await workerThread(sys);
diff --git a/packages/qwik-city/static/node/node-system.ts b/packages/qwik-city/static/node/node-system.ts
index 14904b15f54..1a49d3b11c6 100644
--- a/packages/qwik-city/static/node/node-system.ts
+++ b/packages/qwik-city/static/node/node-system.ts
@@ -2,15 +2,12 @@
 import type { StaticGenerateOptions, System } from '../types';
 import fs from 'node:fs';
 import { dirname, join } from 'node:path';
-import { patchGlobalThis } from '../../middleware/node/node-fetch';
 import { createNodeMainProcess } from './node-main';
 import { createNodeWorkerProcess } from './node-worker';
 import { normalizePath } from '../../utils/fs';
 
 /** @public */
 export async function createSystem(opts: StaticGenerateOptions) {
-  patchGlobalThis();
-
   const createWriteStream = (filePath: string) => {
     return fs.createWriteStream(filePath, {
       flags: 'w',
diff --git a/packages/qwik-labs/package.json b/packages/qwik-labs/package.json
index 5978743698f..70dc3a71f55 100644
--- a/packages/qwik-labs/package.json
+++ b/packages/qwik-labs/package.json
@@ -13,11 +13,10 @@
     "np": "^10.0.5",
     "prettier": "^3.2.5",
     "typescript": "5.4.5",
-    "undici": "*",
     "vite": "^5.2.11"
   },
   "engines": {
-    "node": ">=16.8.0 <18.0.0 || >=18.11"
+    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
   },
   "exports": {
     ".": {
diff --git a/packages/qwik-react/package.json b/packages/qwik-react/package.json
index 977e36c29c3..0853b5f3164 100644
--- a/packages/qwik-react/package.json
+++ b/packages/qwik-react/package.json
@@ -13,7 +13,7 @@
     "vite": "^5.2.10"
   },
   "engines": {
-    "node": ">=16.8.0 <18.0.0 || >=18.11"
+    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
   },
   "exports": {
     ".": {
diff --git a/packages/qwik-worker/package.json b/packages/qwik-worker/package.json
index 0d8b0eef1a1..cbe6f502e96 100644
--- a/packages/qwik-worker/package.json
+++ b/packages/qwik-worker/package.json
@@ -9,7 +9,7 @@
     "vite-plugin-static-copy": "^1.0.4"
   },
   "engines": {
-    "node": ">=16.8.0 <18.0.0 || >=18.11"
+    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
   },
   "exports": {
     ".": {
diff --git a/packages/qwik/package.json b/packages/qwik/package.json
index 415f29a8655..fa0e177da2b 100644
--- a/packages/qwik/package.json
+++ b/packages/qwik/package.json
@@ -33,7 +33,7 @@
     "kleur": "4.1.5"
   },
   "engines": {
-    "node": ">=16.8.0 <18.0.0 || >=18.11"
+    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
   },
   "exports": {
     ".": {
diff --git a/packages/qwik/src/cli/utils/utils.ts b/packages/qwik/src/cli/utils/utils.ts
index 020c64840c7..8cd032a7a47 100644
--- a/packages/qwik/src/cli/utils/utils.ts
+++ b/packages/qwik/src/cli/utils/utils.ts
@@ -81,7 +81,7 @@ export function cleanPackageJson(srcPkg: IntegrationPackageJson) {
     types: srcPkg.types,
     exports: srcPkg.exports,
     files: srcPkg.files,
-    engines: { node: '^18.17.0 || ^20.3.0 || >=21.0.0' },
+    engines: { node: srcPkg.engines?.node || '^18.17.0 || ^20.3.0 || >=21.0.0' },
   };
 
   Object.keys(cleanedPkg).forEach((prop) => {
diff --git a/packages/qwik/src/optimizer/src/plugins/vite-server.ts b/packages/qwik/src/optimizer/src/plugins/vite-server.ts
index 4849c913302..24589ce9498 100644
--- a/packages/qwik/src/optimizer/src/plugins/vite-server.ts
+++ b/packages/qwik/src/optimizer/src/plugins/vite-server.ts
@@ -35,22 +35,9 @@ export async function configureDevServer(
   isClientDevOnly: boolean,
   clientDevInput: string | undefined
 ) {
-  if (typeof fetch !== 'function' && sys.env === 'node') {
-    // polyfill fetch() when not available in Node.js
-
-    try {
-      if (!globalThis.fetch) {
-        const undici = await sys.strictDynamicImport('undici');
-        globalThis.fetch = undici.fetch;
-        globalThis.Headers = undici.Headers;
-        globalThis.Request = undici.Request;
-        globalThis.Response = undici.Response;
-        globalThis.FormData = undici.FormData;
-      }
-    } catch {
-      console.warn('Global fetch() was not installed');
-      // Nothing
-    }
+  if (typeof fetch !== 'function') {
+    console.error('Global fetch() is missing');
+    process.exit(1);
   }
 
   // qwik middleware injected BEFORE vite internal middlewares
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index f1a51d38aa7..3fe3de97d97 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -206,9 +206,6 @@ importers:
       typescript:
         specifier: 5.4.5
         version: 5.4.5
-      undici:
-        specifier: '*'
-        version: 6.18.2
       vfile:
         specifier: ^6.0.1
         version: 6.0.1
@@ -368,9 +365,6 @@ importers:
       typescript:
         specifier: 5.4.5
         version: 5.4.5
-      undici:
-        specifier: '*'
-        version: 6.18.2
       valibot:
         specifier: ^0.29.0
         version: 0.29.0
@@ -505,9 +499,6 @@ importers:
       typescript:
         specifier: 5.4.5
         version: 5.4.5
-      undici:
-        specifier: '*'
-        version: 6.18.2
       vite:
         specifier: ^5.2.11
         version: 5.2.12(@types/node@20.14.1)(terser@5.31.0)
@@ -573,9 +564,6 @@ importers:
       svgo:
         specifier: ^3.2.0
         version: 3.3.2
-      undici:
-        specifier: '*'
-        version: 6.18.2
       vfile:
         specifier: ^6.0.1
         version: 6.0.1
@@ -702,9 +690,6 @@ importers:
       typescript:
         specifier: 5.4.5
         version: 5.4.5
-      undici:
-        specifier: '*'
-        version: 6.18.2
       vite:
         specifier: ^5.2.11
         version: 5.2.12(@types/node@20.14.1)(terser@5.31.0)
diff --git a/scripts/create-qwik-cli.ts b/scripts/create-qwik-cli.ts
index 4d5d09e7e23..b2cd1ccb5b3 100644
--- a/scripts/create-qwik-cli.ts
+++ b/scripts/create-qwik-cli.ts
@@ -217,7 +217,6 @@ async function updatePackageJson(config: BuildConfig, destDir: string) {
   setVersionFromRoot('prettier');
   setVersionFromRoot('typescript');
   setVersionFromRoot('node-fetch');
-  setVersionFromRoot('undici');
   setVersionFromRoot('vite');
 
   await writePackageJson(destDir, pkgJson);
diff --git a/scripts/package-json.ts b/scripts/package-json.ts
index eb32aebc586..50c4a0e20b3 100644
--- a/scripts/package-json.ts
+++ b/scripts/package-json.ts
@@ -21,9 +21,6 @@ export async function generatePackageJson(config: BuildConfig) {
       qwik: './qwik-cli.cjs',
     },
     type: 'module',
-    peerDependencies: {
-      undici: '*',
-    },
     dependencies: rootPkg.dependencies,
     exports: recursiveChangePrefix(rootPkg.exports!, './dist/', './'),
     files: Array.from(new Set(rootPkg.files)).sort((a, b) => {
diff --git a/starters/adapters/firebase/functions/package.json b/starters/adapters/firebase/functions/package.json
index 030d2f83728..d2d34508ec5 100755
--- a/starters/adapters/firebase/functions/package.json
+++ b/starters/adapters/firebase/functions/package.json
@@ -9,15 +9,14 @@
     "logs": "firebase functions:log"
   },
   "engines": {
-    "node": "18"
+    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
   },
   "type": "module",
   "main": "index.js",
   "dependencies": {
     "@google-cloud/functions-framework": "^3.3.0",
     "firebase-admin": "^11.8.0",
-    "firebase-functions": "^4.3.1",
-    "undici": "*"
+    "firebase-functions": "^4.3.1"
   },
   "devDependencies": {
     "firebase-functions-test": "^3.1.0"
diff --git a/starters/apps/base/package.json b/starters/apps/base/package.json
index b6cab10066c..d19f861f2dc 100644
--- a/starters/apps/base/package.json
+++ b/starters/apps/base/package.json
@@ -26,7 +26,6 @@
     "eslint-plugin-qwik": "latest",
     "prettier": "latest",
     "typescript": "latest",
-    "undici": "latest",
     "vite": "^4.5.2",
     "vite-tsconfig-paths": "^4.2.1"
   },
diff --git a/starters/apps/library/package.json b/starters/apps/library/package.json
index 1fec5dc0978..0c388d2a471 100644
--- a/starters/apps/library/package.json
+++ b/starters/apps/library/package.json
@@ -43,7 +43,6 @@
     "np": "^8.0.4",
     "prettier": "latest",
     "typescript": "latest",
-    "undici": "latest",
     "vite": "^4.5.2",
     "vite-tsconfig-paths": "^4.2.1"
   },
diff --git a/starters/dev-server.ts b/starters/dev-server.ts
index 379da438f88..b94a64b94eb 100644
--- a/starters/dev-server.ts
+++ b/starters/dev-server.ts
@@ -332,8 +332,6 @@ function favicon(_: Request, res: Response) {
 }
 
 async function main() {
-  await patchGlobalFetch();
-
   const partytownPath = resolve(
     startersDir,
     "..",
@@ -371,23 +369,3 @@ async function main() {
 }
 
 main();
-
-async function patchGlobalFetch() {
-  if (
-    typeof global !== "undefined" &&
-    typeof globalThis.fetch !== "function" &&
-    typeof process !== "undefined" &&
-    process.versions.node
-  ) {
-    if (!globalThis.fetch) {
-      const { fetch, Headers, Request, Response, FormData } = await import(
-        "undici"
-      );
-      globalThis.fetch = fetch as any;
-      globalThis.Headers = Headers as any;
-      globalThis.Request = Request as any;
-      globalThis.Response = Response as any;
-      globalThis.FormData = FormData as any;
-    }
-  }
-}
diff --git a/tsm.cjs b/tsm.cjs
index f4eedc6d7cb..b5aff3a5154 100644
--- a/tsm.cjs
+++ b/tsm.cjs
@@ -16,21 +16,6 @@ globalThis.qDev = true;
 globalThis.qInspector = false;
 import * as qwikJsx from "${corePath}";`;
 
-if (
-  typeof global !== 'undefined' &&
-  typeof globalThis.fetch !== 'function' &&
-  typeof process !== 'undefined' &&
-  process.versions.node
-) {
-  if (!globalThis.fetch) {
-    const { fetch, Headers, Request, Response, FormData } = require('undici');
-    globalThis.fetch = fetch;
-    globalThis.Headers = Headers;
-    globalThis.Request = Request;
-    globalThis.Response = Response;
-    globalThis.FormData = FormData;
-  }
-}
 module.exports = {
   common: {
     minifyWhitespace: true,