diff --git a/package.json b/package.json
index ef50140..f0698ca 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "knockout-es5",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "description": "Knockout.js meets ECMAScript 5 properties",
   "author": "Steve Sanderson",
   "main": "src/knockout-es5.js",