diff --git a/.travis.yml b/.travis.yml
index f9f3c0b..cddcdbc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,12 +5,6 @@ os:
 language: node_js
 node_js:
   - node
-  - '10'
-  - '9'
-  - '8'
-  - '7'
-  - '6'
-  - '5'
-  - '4'
-  - '0.12'
-  - '0.10'
+  - '16'
+  - '14'
+  - '12'
diff --git a/benchmark/fixtures.js b/benchmark/fixtures.js
index 6dd62f0..89d4609 100644
--- a/benchmark/fixtures.js
+++ b/benchmark/fixtures.js
@@ -1,4 +1,4 @@
-module.exports = {
+export default {
   string: 'foo',
   stringNumber: '1000',
   number: 1000,
diff --git a/benchmark/index.js b/benchmark/index.js
index a2f4b9e..22cc300 100644
--- a/benchmark/index.js
+++ b/benchmark/index.js
@@ -1,6 +1,9 @@
-const { Suite } = require('benchmark');
-const cursor = require('ansi')(process.stdout);
-const fixtures = require('./fixtures');
+import benchmark from 'benchmark'
+import ansi from 'ansi'
+import fixtures from './fixtures.js'
+
+const { Suite } = benchmark
+const cursor = ansi(process.stdout)
 
 const cycle = (e, nl) => {
   cursor.eraseLine();
@@ -54,7 +57,7 @@ bench('number')
   .add('parseFloat', () => run(isNumberParseFloat, 'number'))
   .run()
 
-function isNumberParseFloat(n) {
+function isNumberParseFloat(num) {
   if (typeof num === 'number') {
     return num - num === 0;
   }
@@ -80,7 +83,7 @@ function isNumber60(val) {
   return false;
 }
 
-function isNumber61(val) {
+function isNumber61(num) {
   if (typeof num === 'number') {
     return num - num === 0;
   }
@@ -89,4 +92,3 @@ function isNumber61(val) {
   }
   return false;
 }
-
diff --git a/benchmark/last.md b/benchmark/last.md
index 714f248..cb91c30 100644
--- a/benchmark/last.md
+++ b/benchmark/last.md
@@ -1,3 +1,17 @@
-current.js x 100,502 ops/sec ±0.80% (94 runs sampled)
-isFinite.js x 91,315 ops/sec ±0.92% (89 runs sampled)
-parseFloat.js x 72,464 ops/sec ±1.17% (91 runs sampled)
+# all
+v6.1 x 521,002 ops/sec ±0.94% (91 runs sampled)
+v6.0 x 133,018 ops/sec ±1.26% (94 runs sampled)
+parseFloat x 281,881 ops/sec ±0.32% (93 runs sampled)
+fastest is 'v6.1'
+
+# string
+v6.1 x 3,691,902 ops/sec ±0.43% (97 runs sampled)
+v6.0 x 3,922,010 ops/sec ±0.40% (97 runs sampled)
+parseFloat x 3,171,613 ops/sec ±0.57% (96 runs sampled)
+fastest is 'v6.0'
+
+# number
+v6.1 x 4,354,093 ops/sec ±0.89% (93 runs sampled)
+v6.0 x 4,317,080 ops/sec ±0.31% (97 runs sampled)
+parseFloat x 4,374,071 ops/sec ±0.37% (94 runs sampled)
+fastest is 'parseFloat,v6.1'
diff --git a/index.js b/index.js
index 27f19b7..8433b3f 100644
--- a/index.js
+++ b/index.js
@@ -5,9 +5,7 @@
  * Released under the MIT License.
  */
 
-'use strict';
-
-module.exports = function(num) {
+export default function(num) {
   if (typeof num === 'number') {
     return num - num === 0;
   }
diff --git a/package.json b/package.json
index 3715072..1c68d8e 100644
--- a/package.json
+++ b/package.json
@@ -18,8 +18,9 @@
     "index.js"
   ],
   "main": "index.js",
+  "type": "module",
   "engines": {
-    "node": ">=0.12.0"
+    "node": ">=12.20.0"
   },
   "scripts": {
     "test": "mocha"
diff --git a/test.js b/test.js
index 0f02427..16d4134 100644
--- a/test.js
+++ b/test.js
@@ -5,11 +5,9 @@
  * Licensed under the MIT License.
  */
 
-'use strict';
-
-require('mocha');
-var assert = require('assert');
-var isNumber = require('./');
+import assert from 'node:assert'
+import 'mocha'
+import isNumber from './index.js'
 
 describe('is a number', function() {
   var fixtures = [