diff --git a/package.json b/package.json
index 82d3ba98..f2847d0c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-calendar",
-  "version": "0.4.2-alpha",
+  "version": "0.5.0-alpha",
   "description": "Ultimate date picker for your React application.",
   "main": "build/entry.js",
   "es6": "src/entry.js",
diff --git a/sample/package.json b/sample/package.json
index 432413ed..32550530 100644
--- a/sample/package.json
+++ b/sample/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-calendar-sample-page",
-  "version": "0.4.2-alpha",
+  "version": "0.5.0-alpha",
   "description": "A sample page for React-Calendar.",
   "scripts": {
     "build": "webpack"
diff --git a/test/package.json b/test/package.json
index cfb041ef..3be932e8 100644
--- a/test/package.json
+++ b/test/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-calendar-test-page",
-  "version": "0.4.2-alpha",
+  "version": "0.5.0-alpha",
   "description": "A test page for React-Calendar.",
   "scripts": {
     "build": "webpack",