diff --git a/package.json b/package.json
index 777d9f0d71..a4109035d6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "WordPress",
-  "version": "3.9.0",
+  "version": "4.0.0",
   "description": "WordPress is web software you can use to create a beautiful website or blog.",
   "repository": {
     "type": "svn",
diff --git a/src/readme.html b/src/readme.html
index 3688bb3807..48f59ef8ee 100644
--- a/src/readme.html
+++ b/src/readme.html
@@ -9,7 +9,7 @@
 <body>
 <h1 id="logo">
 	<a href="https://wordpress.org/"><img alt="WordPress" src="wp-admin/images/wordpress-logo.png" /></a>
-	<br /> Version 3.9
+	<br /> Version 4.0
 </h1>
 <p style="text-align: center">Semantic Personal Publishing Platform</p>
 
