diff --git a/package.json b/package.json
index 27421d4e008fa..aa026957e7344 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "private": true,
-  "version": "16.5.1",
+  "version": "16.6.0-alpha.0",
   "workspaces": [
     "packages/*"
   ],
diff --git a/packages/create-subscription/package.json b/packages/create-subscription/package.json
index 8908afd8aec36..0f9a342ee1b28 100644
--- a/packages/create-subscription/package.json
+++ b/packages/create-subscription/package.json
@@ -1,7 +1,7 @@
 {
   "name": "create-subscription",
   "description": "utility for subscribing to external data sources inside React components",
-  "version": "16.5.1",
+  "version": "16.6.0-alpha.0",
   "repository": "facebook/react",
   "files": [
     "LICENSE",
@@ -10,7 +10,7 @@
     "cjs/"
   ],
   "peerDependencies": {
-    "react": "^16.3.0"
+    "react": "^16.3.0 || 16.6.0-alpha.0"
   },
   "devDependencies": {
     "rxjs": "^5.5.6"
diff --git a/packages/react-art/package.json b/packages/react-art/package.json
index 95f4242826679..9b6a6868da55d 100644
--- a/packages/react-art/package.json
+++ b/packages/react-art/package.json
@@ -1,7 +1,7 @@
 {
   "name": "react-art",
   "description": "React ART is a JavaScript library for drawing vector graphics using React. It provides declarative and reactive bindings to the ART library. Using the same declarative API you can render the output to either Canvas, SVG or VML (IE8).",
-  "version": "16.5.1",
+  "version": "16.6.0-alpha.0",
   "main": "index.js",
   "repository": "facebook/react",
   "keywords": [
@@ -23,10 +23,10 @@
     "loose-envify": "^1.1.0",
     "object-assign": "^4.1.1",
     "prop-types": "^15.6.2",
-    "schedule": "^0.4.0"
+    "schedule": "^0.5.0-alpha.0"
   },
   "peerDependencies": {
-    "react": "^16.0.0"
+    "react": "^16.0.0 || 16.6.0-alpha.0"
   },
   "files": [
     "LICENSE",
diff --git a/packages/react-dom/package.json b/packages/react-dom/package.json
index 2ad460879335a..dd33530047fe2 100644
--- a/packages/react-dom/package.json
+++ b/packages/react-dom/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-dom",
-  "version": "16.5.1",
+  "version": "16.6.0-alpha.0",
   "description": "React package for working with the DOM.",
   "main": "index.js",
   "repository": "facebook/react",
@@ -16,10 +16,10 @@
     "loose-envify": "^1.1.0",
     "object-assign": "^4.1.1",
     "prop-types": "^15.6.2",
-    "schedule": "^0.4.0"
+    "schedule": "^0.5.0-alpha.0"
   },
   "peerDependencies": {
-    "react": "^16.0.0"
+    "react": "^16.0.0 || 16.6.0-alpha.0"
   },
   "files": [
     "LICENSE",
diff --git a/packages/react-is/package.json b/packages/react-is/package.json
index 1958580133f25..08b30fd9d2bb3 100644
--- a/packages/react-is/package.json
+++ b/packages/react-is/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-is",
-  "version": "16.5.1",
+  "version": "16.6.0-alpha.0",
   "description": "Brand checking of React Elements.",
   "main": "index.js",
   "repository": "facebook/react",
diff --git a/packages/react-native-renderer/package.json b/packages/react-native-renderer/package.json
index 34748f8d23fc6..b0e8eb6939905 100644
--- a/packages/react-native-renderer/package.json
+++ b/packages/react-native-renderer/package.json
@@ -6,9 +6,9 @@
   "dependencies": {
     "object-assign": "^4.1.1",
     "prop-types": "^15.6.2",
-    "schedule": "^0.4.0"
+    "schedule": "^0.5.0-alpha.0"
   },
   "peerDependencies": {
-    "react": "^16.0.0"
+    "react": "^16.0.0 || 16.6.0-alpha.0"
   }
 }
diff --git a/packages/react-noop-renderer/package.json b/packages/react-noop-renderer/package.json
index 22f5d5d8f9ed9..f3f82b6fd2e7e 100644
--- a/packages/react-noop-renderer/package.json
+++ b/packages/react-noop-renderer/package.json
@@ -13,7 +13,7 @@
     "react-reconciler": "*"
   },
   "peerDependencies": {
-    "react": "^16.0.0"
+    "react": "^16.0.0 || 16.6.0-alpha.0"
   },
   "files": [
     "LICENSE",
diff --git a/packages/react-reconciler/package.json b/packages/react-reconciler/package.json
index 95cd741e3b150..ef455a8ecfa11 100644
--- a/packages/react-reconciler/package.json
+++ b/packages/react-reconciler/package.json
@@ -1,7 +1,7 @@
 {
   "name": "react-reconciler",
   "description": "React package for creating custom renderers.",
-  "version": "0.14.0",
+  "version": "0.15.0-alpha.0",
   "keywords": [
     "react"
   ],
@@ -22,13 +22,13 @@
     "node": ">=0.10.0"
   },
   "peerDependencies": {
-    "react": "^16.0.0"
+    "react": "^16.0.0 || 16.6.0-alpha.0"
   },
   "dependencies": {
     "loose-envify": "^1.1.0",
     "object-assign": "^4.1.1",
     "prop-types": "^15.6.2",
-    "schedule": "^0.4.0"
+    "schedule": "^0.5.0-alpha.0"
   },
   "browserify": {
     "transform": [
diff --git a/packages/react-test-renderer/package.json b/packages/react-test-renderer/package.json
index 5d138c8bf1d68..ca6ba6550c586 100644
--- a/packages/react-test-renderer/package.json
+++ b/packages/react-test-renderer/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-test-renderer",
-  "version": "16.5.1",
+  "version": "16.6.0-alpha.0",
   "description": "React package for snapshot testing.",
   "main": "index.js",
   "repository": "facebook/react",
@@ -17,11 +17,11 @@
   "dependencies": {
     "object-assign": "^4.1.1",
     "prop-types": "^15.6.2",
-    "react-is": "^16.5.1",
-    "schedule": "^0.4.0"
+    "react-is": "^16.6.0-alpha.0",
+    "schedule": "^0.5.0-alpha.0"
   },
   "peerDependencies": {
-    "react": "^16.0.0"
+    "react": "^16.0.0 || 16.6.0-alpha.0"
   },
   "files": [
     "LICENSE",
diff --git a/packages/react/package.json b/packages/react/package.json
index bcc0b14f9977e..738d86f5d585e 100644
--- a/packages/react/package.json
+++ b/packages/react/package.json
@@ -4,7 +4,7 @@
   "keywords": [
     "react"
   ],
-  "version": "16.5.1",
+  "version": "16.6.0-alpha.0",
   "homepage": "https://reactjs.org/",
   "bugs": "https://github.com/facebook/react/issues",
   "license": "MIT",
@@ -24,7 +24,7 @@
     "loose-envify": "^1.1.0",
     "object-assign": "^4.1.1",
     "prop-types": "^15.6.2",
-    "schedule": "^0.4.0"
+    "schedule": "^0.5.0-alpha.0"
   },
   "browserify": {
     "transform": [
diff --git a/packages/schedule/package.json b/packages/schedule/package.json
index a9fda4f9c2ec0..e00f5db3676dc 100644
--- a/packages/schedule/package.json
+++ b/packages/schedule/package.json
@@ -1,6 +1,6 @@
 {
   "name": "schedule",
-  "version": "0.4.0",
+  "version": "0.5.0-alpha.0",
   "description": "Cooperative scheduler for the browser environment.",
   "main": "index.js",
   "repository": "facebook/react",
diff --git a/packages/shared/ReactVersion.js b/packages/shared/ReactVersion.js
index 498f960c2f007..c14960ff09801 100644
--- a/packages/shared/ReactVersion.js
+++ b/packages/shared/ReactVersion.js
@@ -8,4 +8,4 @@
 'use strict';
 
 // TODO: this is special because it gets imported during build.
-module.exports = '16.5.1';
+module.exports = '16.6.0-alpha.0';
diff --git a/packages/simple-cache-provider/package.json b/packages/simple-cache-provider/package.json
index b2e556245365f..da0d3982b42b2 100644
--- a/packages/simple-cache-provider/package.json
+++ b/packages/simple-cache-provider/package.json
@@ -1,7 +1,7 @@
 {
   "name": "simple-cache-provider",
   "description": "A basic cache for React applications",
-  "version": "0.9.0",
+  "version": "0.10.0-alpha.0",
   "repository": "facebook/react",
   "files": [
     "LICENSE",
@@ -10,6 +10,6 @@
     "cjs/"
   ],
   "peerDependencies": {
-    "react": "^16.3.0-alpha.1"
+    "react": "^16.3.0-alpha.1 || 16.6.0-alpha.0"
   }
 }