diff --git a/package.json b/package.json
index f68724bc52..cf9d0f9b7e 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "react-build",
   "private": true,
-  "version": "15.4.2",
+  "version": "15.5.0-rc.1",
   "devDependencies": {
     "aliasify": "^2.0.0",
     "art": "^0.10.1",
diff --git a/packages/react-addons/package.json b/packages/react-addons/package.json
index 49bbacbe12..5041abb679 100644
--- a/packages/react-addons/package.json
+++ b/packages/react-addons/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-addons-template",
-  "version": "15.4.2",
+  "version": "15.5.0-rc.1",
   "main": "index.js",
   "repository": "facebook/react",
   "keywords": [
@@ -13,7 +13,7 @@
     "object-assign": "^4.1.0"
   },
   "peerDependencies": {
-    "react": "^15.4.2"
+    "react": "^15.5.0-rc.1"
   },
   "files": [
     "LICENSE",
diff --git a/packages/react-dom/package.json b/packages/react-dom/package.json
index 5a428fa89f..aa93ff8b95 100644
--- a/packages/react-dom/package.json
+++ b/packages/react-dom/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-dom",
-  "version": "15.4.2",
+  "version": "15.5.0-rc.1",
   "description": "React package for working with the DOM.",
   "main": "index.js",
   "repository": "facebook/react",
@@ -18,7 +18,7 @@
     "object-assign": "^4.1.0"
   },
   "peerDependencies": {
-    "react": "^15.4.2"
+    "react": "^15.5.0-rc.1"
   },
   "files": [
     "LICENSE",
diff --git a/packages/react-native-renderer/package.json b/packages/react-native-renderer/package.json
index 84e42d55bc..b414f0e450 100644
--- a/packages/react-native-renderer/package.json
+++ b/packages/react-native-renderer/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-native-renderer",
-  "version": "15.4.2",
+  "version": "15.5.0-rc.1",
   "description": "React package for use inside react-native.",
   "main": "index.js",
   "repository": "facebook/react",
@@ -18,7 +18,7 @@
     "object-assign": "^4.1.0"
   },
   "peerDependencies": {
-    "react": "^15.4.2"
+    "react": "^15.5.0-rc.1"
   },
   "files": [
     "LICENSE",
diff --git a/packages/react-test-renderer/package.json b/packages/react-test-renderer/package.json
index 42a05ae2e1..0550439b5c 100644
--- a/packages/react-test-renderer/package.json
+++ b/packages/react-test-renderer/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-test-renderer",
-  "version": "15.4.2",
+  "version": "15.5.0-rc.1",
   "description": "React package for snapshot testing.",
   "main": "index.js",
   "repository": "facebook/react",
@@ -19,7 +19,7 @@
     "object-assign": "^4.1.0"
   },
   "peerDependencies": {
-    "react": "^15.4.2"
+    "react": "^15.5.0-rc.1"
   },
   "files": [
     "LICENSE",
diff --git a/packages/react/package.json b/packages/react/package.json
index b544376ce0..85e136bd08 100644
--- a/packages/react/package.json
+++ b/packages/react/package.json
@@ -1,7 +1,7 @@
 {
   "name": "react",
   "description": "React is a JavaScript library for building user interfaces.",
-  "version": "15.4.2",
+  "version": "15.5.0-rc.1",
   "keywords": [
     "react"
   ],
diff --git a/src/ReactVersion.js b/src/ReactVersion.js
index 4887e0c1c5..1b003b4d99 100644
--- a/src/ReactVersion.js
+++ b/src/ReactVersion.js
@@ -11,4 +11,4 @@
 
 'use strict';
 
-module.exports = '15.4.2';
+module.exports = '15.5.0-rc.1';