diff --git a/package.json b/package.json
index 845adb18..448be590 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "levelup",
   "description": "Fast & simple storage - a Node.js-style LevelDB wrapper",
-  "version": "3.1.1",
+  "version": "4.0.0",
   "repository": {
     "type": "git",
     "url": "https://github.com/level/levelup.git"