diff --git a/docs/_config.yml b/docs/_config.yml
index c6779f6cac..f339d2025f 100644
--- a/docs/_config.yml
+++ b/docs/_config.yml
@@ -13,7 +13,7 @@ redcarpet:
 pygments: true
 name: React
 markdown: redcarpet
-react_version: 0.9.0-rc1
+react_version: 0.10.0-alpha
 description: A JavaScript library for building user interfaces
 relative_permalinks: true
 paginate: 5
diff --git a/npm-react/package.json b/npm-react/package.json
index 31d4fb8f7c..5d859744db 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": "0.9.0-rc1",
+  "version": "0.10.0-alpha",
   "keywords": [
     "react"
   ],
diff --git a/package.json b/package.json
index 9c5655414b..99ec4fac79 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": "0.9.0-rc1",
+  "version": "0.10.0-alpha",
   "keywords": [
     "react",
     "jsx",
diff --git a/src/browser/React.js b/src/browser/React.js
index 4298f5b5dc..eecad96f40 100644
--- a/src/browser/React.js
+++ b/src/browser/React.js
@@ -90,6 +90,6 @@ if (__DEV__) {
 
 // Version exists only in the open-source version of React, not in Facebook's
 // internal version.
-React.version = '0.9.0-rc1';
+React.version = '0.10.0-alpha';
 
 module.exports = React;