diff --git a/docs/functions/util_random.random.md b/docs/functions/util_random.random.md
deleted file mode 100644
index 30fefd078f..0000000000
--- a/docs/functions/util_random.random.md
+++ /dev/null
@@ -1,13 +0,0 @@
-# Function: random
-
-▸ `Const` **random**(`array`): `Uint8Array`
-
-#### Parameters
-
-| Name | Type |
-| :------ | :------ |
-| `array` | `Uint8Array` |
-
-#### Returns
-
-`Uint8Array`
diff --git a/docs/modules/util_random.md b/docs/modules/util_random.md
deleted file mode 100644
index c20095b7ae..0000000000
--- a/docs/modules/util_random.md
+++ /dev/null
@@ -1,17 +0,0 @@
-# Module: util/random
-
-## Table of contents
-
-### References
-
-- [default](util_random.md#default)
-
-### Functions
-
-- [random](../functions/util_random.random.md)
-
-## References
-
-### default
-
-Renames and exports: [random](../functions/util_random.random.md)
diff --git a/package.json b/package.json
index 7b8d731c12..50c7130c1d 100644
--- a/package.json
+++ b/package.json
@@ -194,11 +194,6 @@
       "browser": "./dist/browser/util/generate_secret.js",
       "import": "./dist/node/esm/util/generate_secret.js",
       "require": "./dist/node/cjs/util/generate_secret.js"
-    },
-    "./util/random": {
-      "browser": "./dist/browser/util/random.js",
-      "import": "./dist/node/esm/util/random.js",
-      "require": "./dist/node/cjs/util/random.js"
     }
   },
   "typesVersions": {
diff --git a/src/util/random.ts b/src/util/random.ts
deleted file mode 100644
index 10c2db9f8a..0000000000
--- a/src/util/random.ts
+++ /dev/null
@@ -1,9 +0,0 @@
-import runtimeRandom from '../runtime/random.js'
-
-interface GetRandomValuesFunction {
-  (array: Uint8Array): Uint8Array
-}
-
-const random: GetRandomValuesFunction = runtimeRandom
-export { random }
-export default random
diff --git a/test-browser/jwe_asymmetric.js b/test-browser/jwe_asymmetric.js
index b40503a4aa..ebc34687d7 100644
--- a/test-browser/jwe_asymmetric.js
+++ b/test-browser/jwe_asymmetric.js
@@ -1,7 +1,6 @@
 import * as Bowser from 'bowser';
 
 import generateKeyPair from '../dist/browser/util/generate_key_pair';
-import random from '../dist/browser/util/random';
 import FlattenedEncrypt from '../dist/browser/jwe/flattened/encrypt';
 import decryptFlattened from '../dist/browser/jwe/flattened/decrypt';
 import decodeProtectedHeader from '../dist/browser/util/decode_protected_header';
@@ -13,9 +12,9 @@ const p521 = browser.engine.name !== 'WebKit';
 async function test(generate, alg, assert) {
   const { publicKey, privateKey } = await generate();
 
-  const jwe = await new FlattenedEncrypt(random(new Uint8Array(32)))
+  const jwe = await new FlattenedEncrypt(crypto.getRandomValues(new Uint8Array(32)))
     .setProtectedHeader({ alg, enc: 'A256GCM' })
-    .setAdditionalAuthenticatedData(random(new Uint8Array(32)))
+    .setAdditionalAuthenticatedData(crypto.getRandomValues(new Uint8Array(32)))
     .encrypt(publicKey);
 
   assert.ok(decodeProtectedHeader(jwe));
diff --git a/test-browser/jwe_symmetric.js b/test-browser/jwe_symmetric.js
index e656194136..306424bb70 100644
--- a/test-browser/jwe_symmetric.js
+++ b/test-browser/jwe_symmetric.js
@@ -1,7 +1,6 @@
 import * as Bowser from 'bowser';
 
 import generateSecret from '../dist/browser/util/generate_secret';
-import random from '../dist/browser/util/random';
 import FlattenedEncrypt from '../dist/browser/jwe/flattened/encrypt';
 import decryptFlattened from '../dist/browser/jwe/flattened/decrypt';
 import decodeProtectedHeader from '../dist/browser/util/decode_protected_header';
@@ -13,9 +12,9 @@ const aes192 = browser.engine.name !== 'Blink';
 async function test(generate, { alg, enc }, assert) {
   const secretKey = await generate();
 
-  const jwe = await new FlattenedEncrypt(random(new Uint8Array(32)))
+  const jwe = await new FlattenedEncrypt(crypto.getRandomValues(new Uint8Array(32)))
     .setProtectedHeader({ alg, enc })
-    .setAdditionalAuthenticatedData(random(new Uint8Array(32)))
+    .setAdditionalAuthenticatedData(crypto.getRandomValues(new Uint8Array(32)))
     .encrypt(secretKey);
 
   assert.ok(decodeProtectedHeader(jwe));
@@ -155,7 +154,7 @@ QUnit.test(
 
 QUnit.test(
   'PBES2-HS256+A128KW',
-  test.bind(undefined, () => random(new Uint8Array(10)), {
+  test.bind(undefined, () => crypto.getRandomValues(new Uint8Array(10)), {
     alg: 'PBES2-HS256+A128KW',
     enc: 'A256GCM',
   }),
@@ -163,7 +162,7 @@ QUnit.test(
 if (aes192) {
   QUnit.test(
     'PBES2-HS384+A192KW',
-    test.bind(undefined, () => random(new Uint8Array(10)), {
+    test.bind(undefined, () => crypto.getRandomValues(new Uint8Array(10)), {
       alg: 'PBES2-HS384+A192KW',
       enc: 'A256GCM',
     }),
@@ -171,7 +170,7 @@ if (aes192) {
 } else {
   QUnit.test('PBES2-HS384+A192KW', async (assert) => {
     await assert.rejects(
-      test.bind(undefined, () => random(new Uint8Array(10)), {
+      test.bind(undefined, () => crypto.getRandomValues(new Uint8Array(10)), {
         alg: 'PBES2-HS384+A192KW',
         enc: 'A256GCM',
       })(assert),
@@ -180,7 +179,7 @@ if (aes192) {
 }
 QUnit.test(
   'PBES2-HS512+A256KW',
-  test.bind(undefined, () => random(new Uint8Array(10)), {
+  test.bind(undefined, () => crypto.getRandomValues(new Uint8Array(10)), {
     alg: 'PBES2-HS512+A256KW',
     enc: 'A256GCM',
   }),
diff --git a/test-browser/jws.js b/test-browser/jws.js
index 8ac2266e01..a940fcc5d7 100644
--- a/test-browser/jws.js
+++ b/test-browser/jws.js
@@ -2,7 +2,6 @@ import * as Bowser from 'bowser';
 
 import generateKeyPair from '../dist/browser/util/generate_key_pair';
 import generateSecret from '../dist/browser/util/generate_secret';
-import random from '../dist/browser/util/random';
 import FlattenedSign from '../dist/browser/jws/flattened/sign';
 import verifyFlattened from '../dist/browser/jws/flattened/verify';
 import decodeProtectedHeader from '../dist/browser/util/decode_protected_header';
@@ -21,7 +20,7 @@ async function test(generate, alg, assert) {
     ({ publicKey, privateKey } = generated);
   }
 
-  const jws = await new FlattenedSign(random(new Uint8Array(32)))
+  const jws = await new FlattenedSign(crypto.getRandomValues(new Uint8Array(32)))
     .setProtectedHeader({ alg })
     .sign(privateKey);
 
diff --git a/test-cloudflare-workers/cloudflare.test.mjs b/test-cloudflare-workers/cloudflare.test.mjs
index 967ed226a2..4108cb3db5 100644
--- a/test-cloudflare-workers/cloudflare.test.mjs
+++ b/test-cloudflare-workers/cloudflare.test.mjs
@@ -465,16 +465,16 @@ test('A256KW', macro, async () => {
 });
 
 test('PBES2-HS256+A128KW', macro, async () => {
-  const secretKey = utilRandom(new Uint8Array(10));
+  const secretKey = crypto.getRandomValues(new Uint8Array(10));
   await jweSymmetricTest(secretKey, { alg: 'PBES2-HS256+A128KW', enc: 'A256GCM' });
 });
 
 test('PBES2-HS384+A192KW', macro, async () => {
-  const secretKey = utilRandom(new Uint8Array(10));
+  const secretKey = crypto.getRandomValues(new Uint8Array(10));
   await jweSymmetricTest(secretKey, { alg: 'PBES2-HS384+A192KW', enc: 'A256GCM' });
 });
 
 test('PBES2-HS512+A256KW', macro, async () => {
-  const secretKey = utilRandom(new Uint8Array(10));
+  const secretKey = crypto.getRandomValues(new Uint8Array(10));
   await jweSymmetricTest(secretKey, { alg: 'PBES2-HS512+A256KW', enc: 'A256GCM' });
 });
diff --git a/test-cloudflare-workers/template.js b/test-cloudflare-workers/template.js
index e1687d3107..cbc4480184 100644
--- a/test-cloudflare-workers/template.js
+++ b/test-cloudflare-workers/template.js
@@ -20,7 +20,6 @@ import jwtVerify from '../dist/browser/jwt/verify.js';
 import utilDecodeProtectedHeader from '../dist/browser/util/decode_protected_header.js';
 import utilGenerateKeyPair from '../dist/browser/util/generate_key_pair.js';
 import utilGenerateSecret from '../dist/browser/util/generate_secret.js';
-import utilRandom from '../dist/browser/util/random.js';
 import * as keyImport from '../dist/browser/key/import.js';
 import * as keyExport from '../dist/browser/key/export.js';
 
@@ -112,9 +111,9 @@ addEventListener('fetch', (event) => {
 });
 
 async function jweAsymmetricTest({ publicKey, privateKey }, alg) {
-  const jwe = await new jweFlattenedEncrypt(utilRandom(new Uint8Array(32)))
+  const jwe = await new jweFlattenedEncrypt(crypto.getRandomValues(new Uint8Array(32)))
     .setProtectedHeader({ alg, enc: 'A256GCM' })
-    .setAdditionalAuthenticatedData(utilRandom(new Uint8Array(32)))
+    .setAdditionalAuthenticatedData(crypto.getRandomValues(new Uint8Array(32)))
     .encrypt(publicKey);
 
   utilDecodeProtectedHeader(jwe);
@@ -122,7 +121,7 @@ async function jweAsymmetricTest({ publicKey, privateKey }, alg) {
 }
 
 async function jwsAsymmetricTest({ publicKey, privateKey }, alg) {
-  const jws = await new jwsFlattenedSign(utilRandom(new Uint8Array(32)))
+  const jws = await new jwsFlattenedSign(crypto.getRandomValues(new Uint8Array(32)))
     .setProtectedHeader({ alg })
     .sign(privateKey);
 
@@ -131,7 +130,7 @@ async function jwsAsymmetricTest({ publicKey, privateKey }, alg) {
 }
 
 async function jwsSymmetricTest(secretKey, alg) {
-  const jws = await new jwsFlattenedSign(utilRandom(new Uint8Array(32)))
+  const jws = await new jwsFlattenedSign(crypto.getRandomValues(new Uint8Array(32)))
     .setProtectedHeader({ alg })
     .sign(secretKey);
 
@@ -140,9 +139,9 @@ async function jwsSymmetricTest(secretKey, alg) {
 }
 
 async function jweSymmetricTest(secretKey, { alg, enc }) {
-  const jwe = await new jweFlattenedEncrypt(utilRandom(new Uint8Array(32)))
+  const jwe = await new jweFlattenedEncrypt(crypto.getRandomValues(new Uint8Array(32)))
     .setProtectedHeader({ alg, enc })
-    .setAdditionalAuthenticatedData(utilRandom(new Uint8Array(32)))
+    .setAdditionalAuthenticatedData(crypto.getRandomValues(new Uint8Array(32)))
     .encrypt(secretKey);
 
   utilDecodeProtectedHeader(jwe);
diff --git a/test-deno/jwe_asymmetric.test.ts b/test-deno/jwe_asymmetric.test.ts
index 82927a7426..a7770581b8 100644
--- a/test-deno/jwe_asymmetric.test.ts
+++ b/test-deno/jwe_asymmetric.test.ts
@@ -1,7 +1,6 @@
 import { assert, assertThrowsAsync } from 'https://deno.land/std@0.109.0/testing/asserts.ts';
 
 import generateKeyPair from '../dist/deno/util/generate_key_pair.ts';
-import random from '../dist/deno/util/random.ts';
 import FlattenedEncrypt from '../dist/deno/jwe/flattened/encrypt.ts';
 import decryptFlattened from '../dist/deno/jwe/flattened/decrypt.ts';
 import decodeProtectedHeader from '../dist/deno/util/decode_protected_header.ts';
@@ -9,9 +8,9 @@ import decodeProtectedHeader from '../dist/deno/util/decode_protected_header.ts'
 async function test(generate: () => ReturnType<typeof generateKeyPair>, alg: string) {
   const { publicKey, privateKey } = await generate();
 
-  const jwe = await new FlattenedEncrypt(random(new Uint8Array(32)))
+  const jwe = await new FlattenedEncrypt(crypto.getRandomValues(new Uint8Array(32)))
     .setProtectedHeader({ alg, enc: 'A192CBC-HS384' })
-    .setAdditionalAuthenticatedData(random(new Uint8Array(32)))
+    .setAdditionalAuthenticatedData(crypto.getRandomValues(new Uint8Array(32)))
     .encrypt(publicKey);
 
   assert(decodeProtectedHeader(jwe));
diff --git a/test-deno/jwe_symmetric.test.ts b/test-deno/jwe_symmetric.test.ts
index 8c0f6cc76f..7c55f9c37c 100644
--- a/test-deno/jwe_symmetric.test.ts
+++ b/test-deno/jwe_symmetric.test.ts
@@ -1,7 +1,6 @@
 import { assert } from 'https://deno.land/std@0.109.0/testing/asserts.ts';
 
 import generateSecret from '../dist/deno/util/generate_secret.ts';
-import random from '../dist/deno/util/random.ts';
 import FlattenedEncrypt from '../dist/deno/jwe/flattened/encrypt.ts';
 import decryptFlattened from '../dist/deno/jwe/flattened/decrypt.ts';
 import decodeProtectedHeader from '../dist/deno/util/decode_protected_header.ts';
@@ -12,9 +11,9 @@ async function test(
 ) {
   const secretKey = await generate();
 
-  const jwe = await new FlattenedEncrypt(random(new Uint8Array(32)))
+  const jwe = await new FlattenedEncrypt(crypto.getRandomValues(new Uint8Array(32)))
     .setProtectedHeader({ alg, enc })
-    .setAdditionalAuthenticatedData(random(new Uint8Array(32)))
+    .setAdditionalAuthenticatedData(crypto.getRandomValues(new Uint8Array(32)))
     .encrypt(secretKey);
 
   assert(decodeProtectedHeader(jwe));
@@ -119,7 +118,7 @@ Deno.test(
 
 Deno.test(
   'Encrypt/Decrypt PBES2-HS256+A128KW',
-  test.bind(undefined, async () => random(new Uint8Array(10)), {
+  test.bind(undefined, async () => crypto.getRandomValues(new Uint8Array(10)), {
     alg: 'PBES2-HS256+A128KW',
     enc: 'A192CBC-HS384',
   }),
@@ -127,7 +126,7 @@ Deno.test(
 
 Deno.test(
   'Encrypt/Decrypt PBES2-HS384+A192KW',
-  test.bind(undefined, async () => random(new Uint8Array(10)), {
+  test.bind(undefined, async () => crypto.getRandomValues(new Uint8Array(10)), {
     alg: 'PBES2-HS384+A192KW',
     enc: 'A192CBC-HS384',
   }),
@@ -135,7 +134,7 @@ Deno.test(
 
 Deno.test(
   'Encrypt/Decrypt PBES2-HS512+A256KW',
-  test.bind(undefined, async () => random(new Uint8Array(10)), {
+  test.bind(undefined, async () => crypto.getRandomValues(new Uint8Array(10)), {
     alg: 'PBES2-HS512+A256KW',
     enc: 'A192CBC-HS384',
   }),
diff --git a/test-deno/jws.test.ts b/test-deno/jws.test.ts
index 9ad5b4c7b3..b40aa5dd15 100644
--- a/test-deno/jws.test.ts
+++ b/test-deno/jws.test.ts
@@ -6,7 +6,6 @@ import {
 
 import generateKeyPair from '../dist/deno/util/generate_key_pair.ts';
 import generateSecret from '../dist/deno/util/generate_secret.ts';
-import random from '../dist/deno/util/random.ts';
 import FlattenedSign from '../dist/deno/jws/flattened/sign.ts';
 import verifyFlattened from '../dist/deno/jws/flattened/verify.ts';
 import decodeProtectedHeader from '../dist/deno/util/decode_protected_header.ts';
@@ -26,7 +25,7 @@ async function test(
     ({ publicKey, privateKey } = generated);
   }
 
-  const jws = await new FlattenedSign(random(new Uint8Array(32)))
+  const jws = await new FlattenedSign(crypto.getRandomValues(new Uint8Array(32)))
     .setProtectedHeader({ alg })
     .sign(privateKey);
 
diff --git a/test/jwe/flattened.decrypt.test.mjs b/test/jwe/flattened.decrypt.test.mjs
index 7f401fb73a..eb741f35f5 100644
--- a/test/jwe/flattened.decrypt.test.mjs
+++ b/test/jwe/flattened.decrypt.test.mjs
@@ -1,12 +1,12 @@
 import test from 'ava';
+import * as crypto from 'crypto';
 
 const root = !('WEBCRYPTO' in process.env) ? '#dist' : '#dist/webcrypto';
 Promise.all([
   import(`${root}/jwe/flattened/encrypt`),
   import(`${root}/jwe/flattened/decrypt`),
-  import(`${root}/util/random`),
 ]).then(
-  ([{ default: FlattenedEncrypt }, { default: flattenedDecrypt }, { default: random }]) => {
+  ([{ default: FlattenedEncrypt }, { default: flattenedDecrypt }]) => {
     test.before(async (t) => {
       const encode = TextEncoder.prototype.encode.bind(new TextEncoder());
       t.context.plaintext = encode('It’s a dangerous business, Frodo, going out your door.');
@@ -187,7 +187,7 @@ Promise.all([
     });
 
     test('AES CBC + HMAC', async (t) => {
-      const secret = random(new Uint8Array(32));
+      const secret = crypto.randomFillSync(new Uint8Array(32));
       const jwe = await new FlattenedEncrypt(t.context.plaintext)
         .setProtectedHeader({ alg: 'dir', enc: 'A128CBC-HS256' })
         .encrypt(secret);
diff --git a/test/jwe/general.decrypt.test.mjs b/test/jwe/general.decrypt.test.mjs
index 54f75372ff..e0b205df0a 100644
--- a/test/jwe/general.decrypt.test.mjs
+++ b/test/jwe/general.decrypt.test.mjs
@@ -1,18 +1,15 @@
 import test from 'ava';
+import * as crypto from 'crypto';
 
 const root = !('WEBCRYPTO' in process.env) ? '#dist' : '#dist/webcrypto';
-Promise.all([
-  import(`${root}/jwe/flattened/encrypt`),
-  import(`${root}/jwe/general/decrypt`),
-  import(`${root}/util/random`),
-]).then(
-  ([{ default: FlattenedEncrypt }, { default: generalDecrypt }, { default: random }]) => {
+Promise.all([import(`${root}/jwe/flattened/encrypt`), import(`${root}/jwe/general/decrypt`)]).then(
+  ([{ default: FlattenedEncrypt }, { default: generalDecrypt }]) => {
     test.before(async (t) => {
       const encode = TextEncoder.prototype.encode.bind(new TextEncoder());
       t.context.plaintext = encode('It’s a dangerous business, Frodo, going out your door.');
       t.context.additionalAuthenticatedData = encode('The Fellowship of the Ring');
-      t.context.initializationVector = random(new Uint8Array(12));
-      t.context.secret = random(new Uint8Array(16));
+      t.context.initializationVector = crypto.randomFillSync(new Uint8Array(12));
+      t.context.secret = crypto.randomFillSync(new Uint8Array(16));
     });
 
     test('JWS format validation', async (t) => {
diff --git a/test/jwe/smoke.test.mjs b/test/jwe/smoke.test.mjs
index 0f3b9d5000..f72d5c7e0f 100644
--- a/test/jwe/smoke.test.mjs
+++ b/test/jwe/smoke.test.mjs
@@ -1,4 +1,5 @@
 import test from 'ava';
+import * as crypto from 'crypto';
 
 let root;
 let keyRoot;
@@ -15,7 +16,6 @@ if ('WEBCRYPTO' in process.env) {
 Promise.all([
   import(`${root}/jwe/flattened/encrypt`),
   import(`${root}/jwe/flattened/decrypt`),
-  import(`${root}/util/random`),
   import(`${root}/util/base64url`),
   import(`${keyRoot}/key/import`),
   import(`${keyRoot}/util/generate_key_pair`),
@@ -24,7 +24,6 @@ Promise.all([
   ([
     { default: FlattenedEncrypt },
     { default: decryptFlattened },
-    { default: random },
     { encode: base64url },
     { importJWK },
     { default: generateKeyPair },
@@ -158,44 +157,72 @@ Promise.all([
           generate: { crv: 'P-521' },
         },
         octAny: {
-          secret: { ext: false, kty: 'oct', k: base64url(random(new Uint8Array(160 >> 3))) },
+          secret: {
+            ext: false,
+            kty: 'oct',
+            k: base64url(crypto.randomFillSync(new Uint8Array(160 >> 3))),
+          },
           algs: ['PBES2-HS256+A128KW', 'PBES2-HS384+A192KW', 'PBES2-HS512+A256KW'],
           generate: false,
         },
         oct128: {
-          secret: { ext: false, kty: 'oct', k: base64url(random(new Uint8Array(128 >> 3))) },
+          secret: {
+            ext: false,
+            kty: 'oct',
+            k: base64url(crypto.randomFillSync(new Uint8Array(128 >> 3))),
+          },
           algs: ['A128KW'],
         },
         oct192: {
-          secret: { ext: false, kty: 'oct', k: base64url(random(new Uint8Array(192 >> 3))) },
+          secret: {
+            ext: false,
+            kty: 'oct',
+            k: base64url(crypto.randomFillSync(new Uint8Array(192 >> 3))),
+          },
           algs: ['A192KW'],
         },
         oct256: {
-          secret: { ext: false, kty: 'oct', k: base64url(random(new Uint8Array(256 >> 3))) },
+          secret: {
+            ext: false,
+            kty: 'oct',
+            k: base64url(crypto.randomFillSync(new Uint8Array(256 >> 3))),
+          },
           algs: ['A256KW'],
         },
         oct128gcm: {
-          secret: { ext: false, kty: 'oct', k: base64url(random(new Uint8Array(128 >> 3))) },
+          secret: {
+            ext: false,
+            kty: 'oct',
+            k: base64url(crypto.randomFillSync(new Uint8Array(128 >> 3))),
+          },
           algs: ['A128GCM', 'A128GCMKW'],
         },
         oct192gcm: {
-          secret: { ext: false, kty: 'oct', k: base64url(random(new Uint8Array(192 >> 3))) },
+          secret: {
+            ext: false,
+            kty: 'oct',
+            k: base64url(crypto.randomFillSync(new Uint8Array(192 >> 3))),
+          },
           algs: ['A192GCM', 'A192GCMKW'],
         },
         oct256gcm: {
-          secret: { ext: false, kty: 'oct', k: base64url(random(new Uint8Array(256 >> 3))) },
+          secret: {
+            ext: false,
+            kty: 'oct',
+            k: base64url(crypto.randomFillSync(new Uint8Array(256 >> 3))),
+          },
           algs: ['A256GCM', 'A256GCMKW'],
         },
         oct256c: {
-          secret: { kty: 'oct', k: base64url(random(new Uint8Array(256 >> 3))) },
+          secret: { kty: 'oct', k: base64url(crypto.randomFillSync(new Uint8Array(256 >> 3))) },
           algs: ['A128CBC-HS256'],
         },
         oct384c: {
-          secret: { kty: 'oct', k: base64url(random(new Uint8Array(384 >> 3))) },
+          secret: { kty: 'oct', k: base64url(crypto.randomFillSync(new Uint8Array(384 >> 3))) },
           algs: ['A192CBC-HS384'],
         },
         oct512c: {
-          secret: { kty: 'oct', k: base64url(random(new Uint8Array(512 >> 3))) },
+          secret: { kty: 'oct', k: base64url(crypto.randomFillSync(new Uint8Array(512 >> 3))) },
           algs: ['A256CBC-HS512'],
         },
       };
@@ -227,7 +254,7 @@ Promise.all([
             ]);
           }
 
-          const jwe = await new FlattenedEncrypt(random(new Uint8Array(256 >> 3)))
+          const jwe = await new FlattenedEncrypt(crypto.randomFillSync(new Uint8Array(256 >> 3)))
             .setProtectedHeader({ 'urn:example:protected': true })
             .setUnprotectedHeader(
               alg.startsWith('A') && !alg.endsWith('KW')
@@ -239,7 +266,7 @@ Promise.all([
                 ? { alg: 'dir' }
                 : { alg, 'urn:example:unprotected': true },
             )
-            .setAdditionalAuthenticatedData(random(new Uint8Array(128 >> 3)))
+            .setAdditionalAuthenticatedData(crypto.randomFillSync(new Uint8Array(128 >> 3)))
             .encrypt(pub);
           await decryptFlattened(jwe, priv);
         }),
@@ -255,7 +282,7 @@ Promise.all([
             ({ privateKey: priv, publicKey: pub } = await generateKeyPair(alg, fixtures.generate));
           }
 
-          const jwe = await new FlattenedEncrypt(random(new Uint8Array(256 >> 3)))
+          const jwe = await new FlattenedEncrypt(crypto.randomFillSync(new Uint8Array(256 >> 3)))
             .setProtectedHeader({ 'urn:example:protected': true })
             .setUnprotectedHeader(
               alg.startsWith('A') && !alg.endsWith('KW')
@@ -267,7 +294,7 @@ Promise.all([
                 ? { alg: 'dir' }
                 : { alg, 'urn:example:unprotected': true },
             )
-            .setAdditionalAuthenticatedData(random(new Uint8Array(128 >> 3)))
+            .setAdditionalAuthenticatedData(crypto.randomFillSync(new Uint8Array(128 >> 3)))
             .encrypt(pub);
           await decryptFlattened(jwe, priv);
         }),
diff --git a/test/jws/flattened.verify.test.mjs b/test/jws/flattened.verify.test.mjs
index 7622eaf6a2..4aa190d7da 100644
--- a/test/jws/flattened.verify.test.mjs
+++ b/test/jws/flattened.verify.test.mjs
@@ -1,16 +1,13 @@
 import test from 'ava';
+import * as crypto from 'crypto';
 
 const root = !('WEBCRYPTO' in process.env) ? '#dist' : '#dist/webcrypto';
-Promise.all([
-  import(`${root}/jws/flattened/sign`),
-  import(`${root}/jws/flattened/verify`),
-  import(`${root}/util/random`),
-]).then(
-  ([{ default: FlattenedSign }, { default: flattenedVerify }, { default: random }]) => {
+Promise.all([import(`${root}/jws/flattened/sign`), import(`${root}/jws/flattened/verify`)]).then(
+  ([{ default: FlattenedSign }, { default: flattenedVerify }]) => {
     test.before(async (t) => {
       const encode = TextEncoder.prototype.encode.bind(new TextEncoder());
       t.context.plaintext = encode('It’s a dangerous business, Frodo, going out your door.');
-      t.context.secret = random(new Uint8Array(32));
+      t.context.secret = crypto.randomFillSync(new Uint8Array(32));
     });
 
     test('JWS format validation', async (t) => {
@@ -127,7 +124,10 @@ Promise.all([
           message: 'signature verification failed',
           code: 'ERR_JWS_SIGNATURE_VERIFICATION_FAILED',
         };
-        await t.throwsAsync(flattenedVerify(jws, random(new Uint8Array(32))), assertion);
+        await t.throwsAsync(
+          flattenedVerify(jws, crypto.randomFillSync(new Uint8Array(32))),
+          assertion,
+        );
       }
     });
   },
diff --git a/test/jws/general.test.mjs b/test/jws/general.test.mjs
index 88eead9956..8750125907 100644
--- a/test/jws/general.test.mjs
+++ b/test/jws/general.test.mjs
@@ -1,16 +1,13 @@
 import test from 'ava';
+import * as crypto from 'crypto';
 
 const root = !('WEBCRYPTO' in process.env) ? '#dist' : '#dist/webcrypto';
-Promise.all([
-  import(`${root}/jws/general/sign`),
-  import(`${root}/jws/general/verify`),
-  import(`${root}/util/random`),
-]).then(
-  ([{ default: GeneralSign }, { default: generalVerify }, { default: random }]) => {
+Promise.all([import(`${root}/jws/general/sign`), import(`${root}/jws/general/verify`)]).then(
+  ([{ default: GeneralSign }, { default: generalVerify }]) => {
     test.before(async (t) => {
       const encode = TextEncoder.prototype.encode.bind(new TextEncoder());
       t.context.plaintext = encode('It’s a dangerous business, Frodo, going out your door.');
-      t.context.secret = random(new Uint8Array(48));
+      t.context.secret = crypto.randomFillSync(new Uint8Array(48));
     });
 
     test('General JWS signing', async (t) => {
diff --git a/test/jws/restrictions.test.mjs b/test/jws/restrictions.test.mjs
index b32e31aba4..4f39f21e74 100644
--- a/test/jws/restrictions.test.mjs
+++ b/test/jws/restrictions.test.mjs
@@ -18,7 +18,6 @@ Promise.all([
   import(`${root}/jws/flattened/verify`),
   import(`${root}/jwe/flattened/encrypt`),
   import(`${root}/jwe/flattened/decrypt`),
-  import(`${root}/util/random`),
   import(`${root}/util/base64url`),
   import(`${keyRoot}/util/generate_key_pair`),
   import(`${keyRoot}/key/import`),
@@ -28,7 +27,6 @@ Promise.all([
     { default: flattenedVerify },
     { default: FlattenedEncrypt },
     { default: flattenedDecrypt },
-    { default: random },
     base64url,
     { default: generateKeyPair },
     { importJWK },
@@ -68,7 +66,7 @@ Promise.all([
     async function testHMAC(t, alg) {
       const size = parseInt(alg.substr(-3), 10);
       const message = `${alg} requires symmetric keys to be ${size} bits or larger`;
-      const secret = random(new Uint8Array((size >> 3) - 1));
+      const secret = crypto.randomFillSync(new Uint8Array((size >> 3) - 1));
       await t.throwsAsync(
         new FlattenedSign(t.context.payload).setProtectedHeader({ alg }).sign(secret),
         { instanceOf: TypeError, message },
@@ -76,7 +74,7 @@ Promise.all([
 
       const jws = await new FlattenedSign(t.context.payload)
         .setProtectedHeader({ alg })
-        .sign(random(new Uint8Array(size >> 3)));
+        .sign(crypto.randomFillSync(new Uint8Array(size >> 3)));
 
       await t.throwsAsync(flattenedVerify(jws, secret), { instanceOf: TypeError, message });
     }
diff --git a/test/jws/smoke.test.mjs b/test/jws/smoke.test.mjs
index a913dc7d4f..3c5ef23af9 100644
--- a/test/jws/smoke.test.mjs
+++ b/test/jws/smoke.test.mjs
@@ -1,4 +1,5 @@
 import test from 'ava';
+import * as crypto from 'crypto';
 
 let root;
 let keyRoot;
@@ -15,7 +16,6 @@ if ('WEBCRYPTO' in process.env) {
 Promise.all([
   import(`${root}/jws/flattened/sign`),
   import(`${root}/jws/flattened/verify`),
-  import(`${root}/util/random`),
   import(`${root}/util/base64url`),
   import(`${keyRoot}/key/import`),
   import(`${keyRoot}/util/generate_key_pair`),
@@ -24,7 +24,6 @@ Promise.all([
   ([
     { default: FlattenedSign },
     { default: verifyFlattened },
-    { default: random },
     { encode: base64url },
     { importJWK },
     { default: generateKeyPair },
@@ -133,15 +132,27 @@ Promise.all([
           algs: ['ES512'],
         },
         oct256: {
-          secret: { ext: false, kty: 'oct', k: base64url(random(new Uint8Array(256 >> 3))) },
+          secret: {
+            ext: false,
+            kty: 'oct',
+            k: base64url(crypto.randomFillSync(new Uint8Array(256 >> 3))),
+          },
           algs: ['HS256'],
         },
         oct384: {
-          secret: { ext: false, kty: 'oct', k: base64url(random(new Uint8Array(384 >> 3))) },
+          secret: {
+            ext: false,
+            kty: 'oct',
+            k: base64url(crypto.randomFillSync(new Uint8Array(384 >> 3))),
+          },
           algs: ['HS256', 'HS384'],
         },
         oct512: {
-          secret: { ext: false, kty: 'oct', k: base64url(random(new Uint8Array(512 >> 3))) },
+          secret: {
+            ext: false,
+            kty: 'oct',
+            k: base64url(crypto.randomFillSync(new Uint8Array(512 >> 3))),
+          },
           algs: ['HS256', 'HS384', 'HS512'],
         },
       };
@@ -169,7 +180,7 @@ Promise.all([
             ]);
           }
 
-          const jws = await new FlattenedSign(random(new Uint8Array(256 >> 3)))
+          const jws = await new FlattenedSign(crypto.randomFillSync(new Uint8Array(256 >> 3)))
             .setProtectedHeader({ alg })
             .sign(priv);
           await verifyFlattened(jws, pub);
@@ -185,7 +196,7 @@ Promise.all([
             ({ privateKey: priv, publicKey: pub } = await generateKeyPair(alg, fixtures.generate));
           }
 
-          const jws = await new FlattenedSign(random(new Uint8Array(256 >> 3)))
+          const jws = await new FlattenedSign(crypto.randomFillSync(new Uint8Array(256 >> 3)))
             .setProtectedHeader({ alg })
             .sign(priv);
           await verifyFlattened(jws, pub);
diff --git a/tsconfig/base.json b/tsconfig/base.json
index 05125a60ec..5dd8434a6b 100644
--- a/tsconfig/base.json
+++ b/tsconfig/base.json
@@ -32,7 +32,6 @@
     "../src/util/generate_key_pair.ts",
     "../src/util/generate_secret.ts",
     "../src/util/decode_protected_header.ts",
-    "../src/util/random.ts"
   ],
   "compilerOptions": {
     "lib": ["ES6", "DOM"],