diff --git a/npm-react/package.json b/npm-react/package.json
index 895c7a3856..57e0cc96a0 100644
--- a/npm-react/package.json
+++ b/npm-react/package.json
@@ -1,7 +1,7 @@
 {
   "name": "react",
   "description": "React is a JavaScript library for building user interfaces.",
-  "version": "0.12.0-rc1",
+  "version": "0.13.0-alpha",
   "keywords": [
     "react"
   ],
diff --git a/package.json b/package.json
index c400c7a3c6..99b8d240c8 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "react-tools",
   "description": "A set of complementary tools to React, including the JSX transformer.",
-  "version": "0.12.0-rc1",
+  "version": "0.13.0-alpha",
   "keywords": [
     "react",
     "jsx",
diff --git a/src/browser/ui/React.js b/src/browser/ui/React.js
index 4b296ff8a0..171c2de180 100644
--- a/src/browser/ui/React.js
+++ b/src/browser/ui/React.js
@@ -179,6 +179,6 @@ if (__DEV__) {
 
 // Version exists only in the open-source version of React, not in Facebook's
 // internal version.
-React.version = '0.12.0-rc1';
+React.version = '0.13.0-alpha';
 
 module.exports = React;