diff --git a/dev/lib/index.js b/dev/lib/index.js
index cb4cd18..d8e61ce 100644
--- a/dev/lib/index.js
+++ b/dev/lib/index.js
@@ -146,15 +146,11 @@
 
 import {ok as assert} from 'uvu/assert'
 import {toString} from 'mdast-util-to-string'
-import {parse} from 'micromark/lib/parse.js'
-import {preprocess} from 'micromark/lib/preprocess.js'
-import {postprocess} from 'micromark/lib/postprocess.js'
+import {parse, postprocess, preprocess} from 'micromark'
 import {decodeNumericCharacterReference} from 'micromark-util-decode-numeric-character-reference'
 import {decodeString} from 'micromark-util-decode-string'
 import {normalizeIdentifier} from 'micromark-util-normalize-identifier'
-import {codes} from 'micromark-util-symbol/codes.js'
-import {constants} from 'micromark-util-symbol/constants.js'
-import {types} from 'micromark-util-symbol/types.js'
+import {codes, constants, types} from 'micromark-util-symbol'
 import {decodeNamedCharacterReference} from 'decode-named-character-reference'
 import {stringifyPosition} from 'unist-util-stringify-position'
 
diff --git a/package.json b/package.json
index 41e027f..aeb51f5 100644
--- a/package.json
+++ b/package.json
@@ -45,12 +45,12 @@
     "@types/unist": "^2.0.0",
     "decode-named-character-reference": "^1.0.0",
     "mdast-util-to-string": "^3.1.0",
-    "micromark": "^3.0.0",
-    "micromark-util-decode-numeric-character-reference": "^1.0.0",
-    "micromark-util-decode-string": "^1.0.0",
-    "micromark-util-normalize-identifier": "^1.0.0",
-    "micromark-util-symbol": "^1.0.0",
-    "micromark-util-types": "^1.0.0",
+    "micromark": "^4.0.0",
+    "micromark-util-decode-numeric-character-reference": "^2.0.0",
+    "micromark-util-decode-string": "^2.0.0",
+    "micromark-util-normalize-identifier": "^2.0.0",
+    "micromark-util-symbol": "^2.0.0",
+    "micromark-util-types": "^2.0.0",
     "unist-util-stringify-position": "^3.0.0",
     "uvu": "^0.5.0"
   },
@@ -63,7 +63,7 @@
     "hast-util-from-html": "^1.0.0",
     "hast-util-to-html": "^8.0.0",
     "mdast-util-to-hast": "^12.0.0",
-    "micromark-build": "^1.0.0",
+    "micromark-build": "^2.0.0",
     "prettier": "^2.0.0",
     "remark-cli": "^11.0.0",
     "remark-preset-wooorm": "^9.0.0",
diff --git a/readme.md b/readme.md
index bbf7ade..9be48d1 100644
--- a/readme.md
+++ b/readme.md
@@ -150,8 +150,8 @@ Turn markdown into a syntax tree.
 *   `value` ([`Value`][api-value])
     — markdown to parse
 *   `encoding` ([`Encoding`][api-encoding], default: `'utf8'`)
-    — [character encoding][character-encoding] for when `value` is
-    [`Buffer`][buffer]
+    — [character encoding][encoding] for when `value` is
+    [`Uint8Array`][uint8-array]
 *   `options` ([`Options`][api-options], optional)
     — configuration
 
@@ -210,7 +210,7 @@ declare module 'mdast-util-from-markdown' {
 
 ### `Encoding`
 
-Encodings supported by the [`Buffer`][buffer] class (TypeScript type).
+Encodings supported by the [`Uint8Array`][uint8-array] class (TypeScript type).
 
 <!-- To do: link to micromark type, when documented. -->
 
@@ -499,9 +499,9 @@ abide by its terms.
 
 [root]: https://github.com/syntax-tree/mdast#root
 
-[character-encoding]: https://nodejs.org/api/buffer.html#buffer_buffers_and_character_encodings
+[uint8-array]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array
 
-[buffer]: https://nodejs.org/api/buffer.html
+[encoding]: https://nodejs.org/api/util.html#whatwg-supported-encodings
 
 [xss]: https://en.wikipedia.org/wiki/Cross-site_scripting
 
diff --git a/test/index.js b/test/index.js
index 7290d45..0704d65 100644
--- a/test/index.js
+++ b/test/index.js
@@ -3,7 +3,6 @@
  */
 
 import assert from 'node:assert/strict'
-import {Buffer} from 'node:buffer'
 import fs from 'node:fs/promises'
 import test from 'node:test'
 import {toHast} from 'mdast-util-to-hast'
@@ -65,17 +64,33 @@ test('fromMarkdown', () => {
     'should parse a paragraph'
   )
 
+  assert.deepEqual(
+    fromMarkdown(new Uint8Array()),
+    {
+      type: 'root',
+      children: [],
+      position: {
+        start: {line: 1, column: 1, offset: 0},
+        end: {line: 1, column: 1, offset: 0}
+      }
+    },
+    'should support empty typed arrays'
+  )
+
   assert.equal(
-    toString(fromMarkdown(Buffer.from([0x62, 0x72, 0xc3, 0xa1, 0x76, 0x6f]))),
-    'brávo',
-    'should support buffers'
+    toString(fromMarkdown(new TextEncoder().encode('<admin@example.com>'))),
+    'admin@example.com',
+    'should support types arrays'
   )
 
   assert.equal(
     toString(
-      fromMarkdown(Buffer.from([0x62, 0x72, 0xc3, 0xa1, 0x76, 0x6f]), 'ascii')
+      fromMarkdown(
+        new Uint8Array([0xff, 0xfe, 0x61, 0x00, 0x62, 0x00, 0x63, 0x00]),
+        'utf-16le'
+      )
     ),
-    'brC!vo',
+    'abc',
     'should support encoding'
   )