diff --git a/packages/react-devtools-core/README.md b/packages/react-devtools-core/README.md
index 7bb1a2e0b716f..35615b3074e48 100644
--- a/packages/react-devtools-core/README.md
+++ b/packages/react-devtools-core/README.md
@@ -1,6 +1,6 @@
 # `react-devtools-core`
 
-A standalone React DevTools implementation.  
+A standalone React DevTools implementation.
 
 This is a low-level package. If you're looking for the Electron app you can run, **use `react-devtools` package instead.**
 
diff --git a/packages/react-devtools-core/package.json b/packages/react-devtools-core/package.json
index f560258e8f76a..2f4bd08239cc9 100644
--- a/packages/react-devtools-core/package.json
+++ b/packages/react-devtools-core/package.json
@@ -1,7 +1,7 @@
 {
   "name": "react-devtools-core",
+  "version": "4.0.0-alpha.0",
   "description": "Use react-devtools outside of the browser",
-  "version": "4.0.0",
   "license": "MIT",
   "main": "./dist/backend.js",
   "repository": {
diff --git a/packages/react-devtools/package.json b/packages/react-devtools/package.json
index e16415d677a5e..21a9bcca55367 100644
--- a/packages/react-devtools/package.json
+++ b/packages/react-devtools/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-devtools",
-  "version": "4.0.0",
+  "version": "4.0.0-alpha.0",
   "description": "Use react-devtools outside of the browser",
   "license": "MIT",
   "repository": {
@@ -25,7 +25,7 @@
     "electron": "^5.0.0",
     "ip": "^1.1.4",
     "minimist": "^1.2.0",
-    "react-devtools-core": "^4.0.0",
+    "react-devtools-core": "4.0.0-alpha.0",
     "update-notifier": "^2.1.0"
   }
 }