diff --git a/history.md b/history.md
index 78c092e3..1a146999 100644
--- a/history.md
+++ b/history.md
@@ -2,6 +2,12 @@
 
 <!--lint disable no-multiple-toplevel-headings-->
 
+4.0.0 / 2016-05-24
+==================
+
+*   Rewrite library ([`a070ad0`](https://github.com/wooorm/unified/commit/a070ad0) and [`b64f512`](https://github.com/wooorm/unified/commit/b64f512))
+*   Update dev-dependencies ([`fa9ac36`](https://github.com/wooorm/unified/commit/fa9ac36))
+
 3.0.0 / 2016-02-13
 ==================
 
diff --git a/package.json b/package.json
index 1f01b597..9ed11e03 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "unified",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "description": "Pluggable text processing interface",
   "license": "MIT",
   "keywords": [