diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 153b1891..033d4c8a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -20,7 +20,7 @@ jobs:
       - name: Install Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: 18
+          node-version: 19
           cache: pnpm
       - name: Install dependencies
         run: pnpm install --frozen-lockfile --ignore-scripts
@@ -33,6 +33,7 @@ jobs:
     strategy:
       matrix:
         node-version:
+          - 18
           - 16
           - 14
     name: Node.js ${{ matrix.node-version }} Quick
diff --git a/test/async.test.js b/test/async.test.js
index ecaa141b..ea1eb19d 100644
--- a/test/async.test.js
+++ b/test/async.test.js
@@ -5,14 +5,16 @@ import { urlAlphabet } from '../index.js'
 import * as browser from '../async/index.browser.js'
 import * as node from '../async/index.js'
 
-global.crypto = {
-  getRandomValues(array) {
-    for (let i = 0; i < array.length; i++) {
-      array[i] = Math.floor(Math.random() * 256)
+Object.defineProperty(global, 'crypto', {
+  value: {
+    getRandomValues(array) {
+      for (let i = 0; i < array.length; i++) {
+        array[i] = Math.floor(Math.random() * 256)
+      }
+      return array
     }
-    return array
   }
-}
+})
 
 function times(size, callback) {
   let array = []
diff --git a/test/index.test.js b/test/index.test.js
index ce0ec1ce..e12aa5ef 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -5,14 +5,16 @@ import * as browser from '../index.browser.js'
 import * as node from '../index.js'
 
 test.before(() => {
-  global.crypto = {
-    getRandomValues(array) {
-      for (let i = 0; i < array.length; i++) {
-        array[i] = Math.floor(Math.random() * 256)
+  Object.defineProperty(global, 'crypto', {
+    value: {
+      getRandomValues(array) {
+        for (let i = 0; i < array.length; i++) {
+          array[i] = Math.floor(Math.random() * 256)
+        }
+        return array
       }
-      return array
     }
-  }
+  })
 })
 
 test.after(() => {
diff --git a/test/react-native-polyfill.test.js b/test/react-native-polyfill.test.js
index 7dd730ab..642e13d2 100644
--- a/test/react-native-polyfill.test.js
+++ b/test/react-native-polyfill.test.js
@@ -8,19 +8,20 @@ test.before(() => {
     product: 'ReactNative'
   }
 
-  global.crypto = {
-    getRandomValues(array) {
-      for (let i = 0; i < array.length; i++) {
-        array[i] = Math.floor(Math.random() * 256)
+  Object.defineProperty(global, 'crypto', {
+    value: {
+      getRandomValues(array) {
+        for (let i = 0; i < array.length; i++) {
+          array[i] = Math.floor(Math.random() * 256)
+        }
+        return array
       }
-      return array
     }
-  }
+  })
 })
 
 test.after(() => {
   delete global.navigator
-  delete global.crypto
 })
 
 test('works with polyfill', () => {