diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 4569606..5729601 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -15,15 +15,21 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node: [8, 10, 12, 14, 16, 18, 20, 22]
+        node: [14.18.0, 14, 16.0.0, 16, 18, 20, 22]
         os: [ubuntu-latest, windows-latest, macOS-latest]
+        exclude:
+          # Node 14 is not available on macos anymore
+          - os: macos-latest
+            node: 14
+          - os: macos-latest
+            node: 14.18.0
 
     steps:
       - name: Clone repository
         uses: actions/checkout@v2
 
       - name: Setup Node.js
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node }}
 
diff --git a/index.js b/index.js
index ddb212e..cebc941 100644
--- a/index.js
+++ b/index.js
@@ -7,7 +7,7 @@
 
 'use strict';
 
-const util = require('util');
+const util = require('node:util');
 const toRegexRange = require('to-regex-range');
 
 const isObject = val => val !== null && typeof val === 'object' && !Array.isArray(val);
diff --git a/package.json b/package.json
index 582357f..b8331f3 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
   ],
   "main": "index.js",
   "engines": {
-    "node": ">=8"
+    "node": ">=14.18.0 <15 || >=16"
   },
   "scripts": {
     "lint": "eslint --cache --cache-location node_modules/.cache/.eslintcache --report-unused-disable-directives --ignore-path .gitignore .",
@@ -35,7 +35,7 @@
   },
   "devDependencies": {
     "gulp-format-md": "^2.0.0",
-    "mocha": "^6.1.1",
+    "mocha": "^10.7.0",
     "nyc": "^15.1.0"
   },
   "keywords": [
diff --git a/test/errors.js b/test/errors.js
index 1a689b5..5bd1474 100644
--- a/test/errors.js
+++ b/test/errors.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const assert = require('assert');
+const assert = require('node:assert');
 const fill = require('..');
 
 describe('error handling', () => {
diff --git a/test/invalid.js b/test/invalid.js
index bc2f3bc..f4ebe20 100644
--- a/test/invalid.js
+++ b/test/invalid.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const assert = require('assert');
+const assert = require('node:assert');
 const fill = require('..');
 
 describe('invalid ranges', () => {
diff --git a/test/matching.js b/test/matching.js
index b8283bb..b8704f8 100644
--- a/test/matching.js
+++ b/test/matching.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const assert = require('assert');
+const assert = require('node:assert');
 const fill = require('..');
 
 const toRegex = (...args) => new RegExp(`^(${fill(...args)})$`);
diff --git a/test/options.js b/test/options.js
index 2c7ea62..d7e773d 100644
--- a/test/options.js
+++ b/test/options.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const assert = require('assert');
+const assert = require('node:assert');
 const exact = require('./support/exact');
 const fill = require('..');
 
diff --git a/test/padding.js b/test/padding.js
index c763b49..de78302 100644
--- a/test/padding.js
+++ b/test/padding.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const assert = require('assert').strict;
+const assert = require('node:assert').strict;
 const fill = require('..');
 
 describe('padding: numbers', () => {
diff --git a/test/support/exact.js b/test/support/exact.js
index 012add6..d5a7b39 100644
--- a/test/support/exact.js
+++ b/test/support/exact.js
@@ -1,7 +1,7 @@
 'use strict';
 
-const assert = require('assert');
-const util = require('util');
+const assert = require('node:assert');
+const util = require('node:util');
 
 module.exports = (actual, expected) => {
   assert(Array.isArray(actual));
diff --git a/test/verify-matches.js b/test/verify-matches.js
index f0fb671..a79fb30 100644
--- a/test/verify-matches.js
+++ b/test/verify-matches.js
@@ -7,7 +7,7 @@
 
 'use strict';
 
-const assert = require('assert');
+const assert = require('node:assert');
 const expand = require('./support/expand');
 const fill = require('..');
 let count = 0;