diff --git a/package.json b/package.json
index 1671d2f..7d26bff 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "rehype-slug",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "description": "rehype plugin to add `id` attributes to headings",
   "license": "MIT",
   "keywords": [