diff --git a/CHANGELOG.md b/CHANGELOG.md
index 13a0b81..2e9746c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+<a name="4.0.0"></a>
+# [4.0.0](https://github.com/whyrusleeping/js-mafmt/compare/v3.1.0...v4.0.0) (2018-02-12)
+
+
+
 <a name="3.1.0"></a>
 # [3.1.0](https://github.com/whyrusleeping/js-mafmt/compare/v3.0.2...v3.1.0) (2018-02-12)
 
diff --git a/package.json b/package.json
index 220f833..a5f3e6c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mafmt",
-  "version": "3.1.0",
+  "version": "4.0.0",
   "description": "A multiaddr validator",
   "main": "src/index.js",
   "scripts": {