diff --git a/package.json b/package.json
index 152813f..868d649 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "rehype-slug",
-  "version": "5.1.0",
+  "version": "6.0.0",
   "description": "rehype plugin to add `id` attributes to headings",
   "license": "MIT",
   "keywords": [
diff --git a/readme.md b/readme.md
index a94c02f..ee9e59e 100644
--- a/readme.md
+++ b/readme.md
@@ -61,14 +61,14 @@ npm install rehype-slug
 In Deno with [`esm.sh`][esmsh]:
 
 ```js
-import rehypeSlug from 'https://esm.sh/rehype-slug@5'
+import rehypeSlug from 'https://esm.sh/rehype-slug@6'
 ```
 
 In browsers with [`esm.sh`][esmsh]:
 
 ```html
 <script type="module">
-  import rehypeSlug from 'https://esm.sh/rehype-slug@5?bundle'
+  import rehypeSlug from 'https://esm.sh/rehype-slug@6?bundle'
 </script>
 ```