diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index f0096d6..5423c45 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -25,7 +25,7 @@ jobs:
     strategy:
       matrix:
         os: ['ubuntu-latest', 'windows-latest']
-        node: ['12.0']
+        node: ['12.17.0']
     name: Testing Node ${{ matrix.node }} on ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
@@ -43,7 +43,7 @@ jobs:
     strategy:
       matrix:
         os: ['ubuntu-latest', 'windows-latest']
-        node: ['12.0', '14.0', '16.0']
+        node: ['12.17.0', '14.0', '16.0']
     name: Testing Node ${{ matrix.node }} on ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
diff --git a/.gitignore b/.gitignore
index a353a36..08cddfa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,4 +5,5 @@ npm-debug.log*
 .nyc_output
 coverage.info
 test/fixtures/*/build
+lib
 node_modules
\ No newline at end of file
diff --git a/README.md b/README.md
index 1bdd0b7..2a24d81 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ yarn add @metalsmith/markdown
 ## Usage
 
 ```js
-const markdown = require('@metalsmith/markdown')
+import markdown from '@metalsmith/markdown'
 
 metalsmith.use(
   markdown({
@@ -111,8 +111,8 @@ would be transformed into:
 You can use a custom renderer by using `marked.Renderer()`
 
 ```js
-const markdown = require('@metalsmith/markdown')
-const marked = require('marked')
+import markdown from '@metalsmith/markdown'
+import { marked } from 'marked'
 const markdownRenderer = new marked.Renderer()
 
 markdownRenderer.image = function (href, title, text) {
diff --git a/package.json b/package.json
index 89244cc..025c9bd 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,14 @@
   "maintainers": [
     "Kevin Van Lierde (https://webketje.com)"
   ],
-  "main": "lib/index.js",
+  "source": "src/index.js",
+  "main": "lib/index.cjs",
+  "module": "lib/index.js",
+  "exports": {
+    "import": "./lib/index.js",
+    "require": "./lib/index.cjs"
+  },
+  "type": "module",
   "files": [
     "lib/*.js"
   ],
@@ -36,8 +43,10 @@
     "format:check": "prettier --list-different \"**/*.{yml,md,js,json}\"",
     "lint": "eslint --fix .",
     "lint:check": "eslint --fix-dry-run .",
-    "release": "release-it .",
-    "test": "nyc mocha"
+    "release": "npm run build && release-it .",
+    "build": "microbundle --target node --no-sourcemap -f cjs,esm",
+    "test": "nyc mocha",
+    "pretest": "npm run build"
   },
   "dependencies": {
     "dlv": "^1.1.3",
@@ -52,6 +61,7 @@
     "eslint-plugin-import": "^2.26.0",
     "eslint-plugin-node": "^11.1.0",
     "metalsmith": "^2.5.0",
+    "microbundle": "^0.15.1",
     "mocha": "^9.2.2",
     "nyc": "^15.1.0",
     "prettier": "^2.7.1",
@@ -64,6 +74,6 @@
     "access": "public"
   },
   "engines": {
-    "node": ">=12"
+    "node": ">=12.17.0 <13.0.0-0||>=13.2.0"
   }
 }
diff --git a/lib/expand-wildcard-keypath.js b/src/expand-wildcard-keypath.js
similarity index 96%
rename from lib/expand-wildcard-keypath.js
rename to src/expand-wildcard-keypath.js
index 7a5d84b..1f7bc18 100644
--- a/lib/expand-wildcard-keypath.js
+++ b/src/expand-wildcard-keypath.js
@@ -1,4 +1,4 @@
-const get = require('dlv')
+import get from 'dlv'
 
 function error(name, msg) {
   const err = new Error(msg)
@@ -63,4 +63,4 @@ function expandWildcardKeypath(root, keypaths, char) {
   return expanded
 }
 
-module.exports = expandWildcardKeypath
+export default expandWildcardKeypath
diff --git a/lib/index.js b/src/index.js
similarity index 87%
rename from lib/index.js
rename to src/index.js
index 24c4c6d..0ca0772 100644
--- a/lib/index.js
+++ b/src/index.js
@@ -1,8 +1,8 @@
-const { basename, dirname, extname, join } = require('path')
-const get = require('dlv')
-const set = require('dset').dset
-const { marked } = require('marked')
-const expandWildcardKeypaths = require('./expand-wildcard-keypath')
+import { basename, dirname, extname, join } from 'path'
+import get from 'dlv'
+import { dset as set } from 'dset'
+import { marked } from 'marked'
+import expandWildcardKeypaths from './expand-wildcard-keypath.js'
 
 function render(data, key, options) {
   const value = get(data, key)
@@ -72,4 +72,4 @@ function initMarkdown(options = defaultOptions) {
   }
 }
 
-module.exports = initMarkdown
+export default initMarkdown
diff --git a/test/index.js b/test/index.cjs
similarity index 96%
rename from test/index.js
rename to test/index.cjs
index f35b145..2552636 100644
--- a/test/index.js
+++ b/test/index.cjs
@@ -5,7 +5,7 @@ const equal = require('assert-dir-equal')
 const Metalsmith = require('metalsmith')
 const { name } = require('../package.json')
 const markdown = require('..')
-const expandWildcardKeypath = require('../lib/expand-wildcard-keypath')
+let expandWildcardKeypath
 const path = require('path')
 
 function msCommon(dir) {
@@ -13,6 +13,12 @@ function msCommon(dir) {
 }
 
 describe('@metalsmith/markdown', function () {
+  before(function (done) {
+    import('../src/expand-wildcard-keypath.js').then(imported => {
+      expandWildcardKeypath = imported
+      done()
+    }) 
+  })
   it('should export a named plugin function matching package.json name', function () {
     const namechars = name.split('/')[1]
     const camelCased = namechars.split('').reduce((str, char, i) => {