diff --git a/package.json b/package.json
index 17f74a8b9d..94cc4524c6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "WordPress",
-  "version": "4.2.0",
+  "version": "4.3.0",
   "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 f09135ac51..e29c0929cb 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 4.2
+	<br /> Version 4.3
 </h1>
 <p style="text-align: center">Semantic Personal Publishing Platform</p>
 
diff --git a/src/wp-includes/version.php b/src/wp-includes/version.php
index 167f214672..50bc84abb9 100644
--- a/src/wp-includes/version.php
+++ b/src/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-RC4-32271-src';
+$wp_version = '4.3-alpha-32280-src';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
