diff --git a/package.json b/package.json
index 6ce66253..de8c4a93 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-calendar",
-  "version": "0.3.0-alpha",
+  "version": "0.4.0-alpha",
   "description": "Ultimate date picker for your React application.",
   "main": "build/entry.js",
   "es6": "src/entry.js",