diff --git a/.eslintrc.js b/.eslintrc.cjs
similarity index 100%
rename from .eslintrc.js
rename to .eslintrc.cjs
diff --git a/README.md b/README.md
index 42f7567..6fc4acc 100644
--- a/README.md
+++ b/README.md
@@ -26,8 +26,9 @@ Add `please-upgrade-node` at the top of your CLI
 
 ```js
 #!/usr/bin/env node
-const pkg = require('./package.json')
-require('please-upgrade-node')(pkg) // <- Must run BEFORE requiring any other modules
+import pkg from './package.json' with { type: 'json' }
+import pleaseUpgrade from 'please-upgrade-node'
+pleaseUpgrade(pkg) // <- Must run BEFORE requiring any other modules
 
 // ...
 ```
diff --git a/index.d.ts b/index.d.ts
index b5d6b51..057957c 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -8,4 +8,4 @@ declare function pleaseUpgradeNode(
   opts?: Partial<Options>
 ): void;
 
-export = pleaseUpgradeNode;
+export default pleaseUpgradeNode;
diff --git a/index.js b/index.js
index 9023106..4a892c6 100644
--- a/index.js
+++ b/index.js
@@ -1,25 +1,25 @@
-var semverCompare = require('semver-compare')
+import process from 'node:process'
 
-module.exports = function pleaseUpgradeNode(pkg, opts) {
-  var opts = opts || {}
-  var requiredVersion = pkg.engines.node.replace('>=', '')
-  var currentVersion = process.version.replace('v', '')
-  if (semverCompare(currentVersion, requiredVersion) === -1) {
-    if (opts.message) {
-      console.error(opts.message(requiredVersion))
-    } else {
-      console.error(
-        pkg.name +
-          ' requires at least version ' +
-          requiredVersion +
-          ' of Node, please upgrade'
-      )
-    }
-
-    if (opts.hasOwnProperty('exitCode')) {
-      process.exit(opts.exitCode)
-    } else {
-      process.exit(1)
-    }
+export default function pleaseUpgradeNode(pkg = {}, opts = {}) {
+  const requiredVersion = pkg.engines.node.replace('>=', '')
+  const currentVersion = process.version.replace('v', '')
+  if (compare(currentVersion, requiredVersion) === -1) {
+    console.error(opts.message && typeof opts.message === 'function' ? opts.message(requiredVersion) : `${pkg.name} requires at least version ${requiredVersion} of Node, please upgrade`)
+    process.exit(opts.hasOwnProperty('exitCode') ? opts.exitCode : 1)
   }
 }
+
+// from semver-compare
+function compare(a, b) {
+	const pa = a.split('.');
+  const pb = b.split('.');
+  for (let i = 0; i < 3; i++) {
+    const na = Number(pa[i]);
+    const nb = Number(pb[i]);
+    if (na > nb) return 1;
+    if (nb > na) return -1;
+    if (!isNaN(na) && isNaN(nb)) return 1;
+    if (isNaN(na) && !isNaN(nb)) return -1;
+  }
+  return 0;
+}
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 763008c..4d8d590 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,9 +8,6 @@
       "name": "please-upgrade-node",
       "version": "3.2.0",
       "license": "MIT",
-      "dependencies": {
-        "semver-compare": "^1.0.0"
-      },
       "devDependencies": {
         "tape": "^5.6.3"
       }
@@ -893,11 +890,6 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/semver-compare": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/semver-compare/-/semver-compare-1.0.0.tgz",
-      "integrity": "sha1-De4hahyUGrN+nvsXiPavxf9VN/w="
-    },
     "node_modules/side-channel": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.0.4.tgz",
diff --git a/package.json b/package.json
index cc00817..0081185 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
     "verify",
     "upgrade"
   ],
+  "type": "module",
   "author": "typicode",
   "license": "MIT",
   "bugs": {
@@ -26,8 +27,5 @@
   "homepage": "https://github.com/typicode/please-upgrade-node#readme",
   "devDependencies": {
     "tape": "^5.6.3"
-  },
-  "dependencies": {
-    "semver-compare": "^1.0.0"
   }
 }
diff --git a/test.js b/test.js
index 8e718e2..f8e7a0b 100644
--- a/test.js
+++ b/test.js
@@ -1,18 +1,19 @@
-var tape = require('tape')
-var pleaseUpgrade = require('./')
+import process from 'node:process'
+import tape from 'tape'
+import pleaseUpgrade from './index.js'
 
 // Change process.version value
 Object.defineProperty(process, 'version', { value: 'v10.0.0' })
 
 // Mock process.exit and console.error
-var exitCode = null
-process.exit = function(code) {
+let exitCode = null
+process.exit = (code) => {
   exitCode = code
 }
 
-var errorMessage = null
-consoleError = console.error
-console.error = function(msg) {
+let errorMessage = null
+const consoleError = console.error
+console.error = (msg) => {
   errorMessage = msg
   consoleError(msg)
 }
@@ -26,7 +27,7 @@ function test(name, cb) {
 }
 
 // Actual tests
-test('>=1.2.0 should not exit', function(t) {
+test('>=1.2.0 should not exit', (t) => {
   pleaseUpgrade({
     name: 'Lorem Ipsum',
     engines: {
@@ -38,7 +39,7 @@ test('>=1.2.0 should not exit', function(t) {
   t.end()
 })
 
-test('>=4 should not exit', function(t) {
+test('>=4 should not exit', (t) => {
   pleaseUpgrade({
     name: 'Lorem Ipsum',
     engines: {
@@ -50,7 +51,7 @@ test('>=4 should not exit', function(t) {
   t.end()
 })
 
-test('>=4.0.0 should not exit', function(t) {
+test('>=4.0.0 should not exit', (t) => {
   pleaseUpgrade({
     name: 'Lorem Ipsum',
     engines: {
@@ -62,7 +63,7 @@ test('>=4.0.0 should not exit', function(t) {
   t.end()
 })
 
-test('>=10.0.1 (patch) should exit', function(t) {
+test('>=10.0.1 (patch) should exit', (t) => {
   pleaseUpgrade({
     name: 'Lorem Ipsum',
     engines: {
@@ -77,7 +78,7 @@ test('>=10.0.1 (patch) should exit', function(t) {
   t.end()
 })
 
-test('>=12 should exit', function(t) {
+test('>=12 should exit', (t) => {
   pleaseUpgrade({
     name: 'Lorem Ipsum',
     engines: {
@@ -92,7 +93,7 @@ test('>=12 should exit', function(t) {
   t.end()
 })
 
-test('>=12.0.0 should exit', function(t) {
+test('>=12.0.0 should exit', (t) => {
   pleaseUpgrade({
     name: 'Lorem Ipsum',
     engines: {
@@ -107,7 +108,7 @@ test('>=12.0.0 should exit', function(t) {
   t.end()
 })
 
-test('should exit with custom code 0', function(t) {
+test('should exit with custom code 0', (t) => {
   pleaseUpgrade(
     {
       name: 'Lorem Ipsum',
@@ -127,7 +128,7 @@ test('should exit with custom code 0', function(t) {
   t.end()
 })
 
-test('should exit with custom code 2', function(t) {
+test('should exit with custom code 2', (t) => {
   pleaseUpgrade(
     {
       name: 'Lorem Ipsum',
@@ -147,7 +148,7 @@ test('should exit with custom code 2', function(t) {
   t.end()
 })
 
-test('should display custom message', function(t) {
+test('should display custom message', (t) => {
   pleaseUpgrade(
     {
       name: 'Lorem Ipsum',
@@ -156,7 +157,7 @@ test('should display custom message', function(t) {
       }
     },
     {
-      message: function(requiredVersion) {
+      message: (requiredVersion) => {
         return 'Required version is ' + requiredVersion
       }
     }