diff --git a/wp-includes/version.php b/wp-includes/version.php
index a2209bc9ee..401927eb03 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -2,6 +2,6 @@
 
 // This just holds the version number, in a separate file so we can bump it without cluttering the SVN
 
-$wp_version = '1.5.2';
+$wp_version = '1.5.3-beta1';
 
 ?>