diff --git a/core/Version.php b/core/Version.php
index def72d38f1613e1b54eafa10c27d10d88ca5cda2..8c2592d6207c530517bb11a4a68285593347b52b 100644
--- a/core/Version.php
+++ b/core/Version.php
@@ -20,7 +20,7 @@ final class Version
      * The current Piwik version.
      * @var string
      */
-    const VERSION = '3.1.0';
+    const VERSION = '3.1.1-b1';
 
     public function isStableVersion($version)
     {