diff --git a/src/Symfony/Component/HttpKernel/Kernel.php b/src/Symfony/Component/HttpKernel/Kernel.php
index c64db087a0..dfee25db57 100644
--- a/src/Symfony/Component/HttpKernel/Kernel.php
+++ b/src/Symfony/Component/HttpKernel/Kernel.php
@@ -59,12 +59,12 @@ abstract class Kernel implements KernelInterface, TerminableInterface
     protected $startTime;
     protected $loadClassCache;
 
-    const VERSION         = '2.5.5';
-    const VERSION_ID      = '20505';
+    const VERSION         = '2.5.6-DEV';
+    const VERSION_ID      = '20506';
     const MAJOR_VERSION   = '2';
     const MINOR_VERSION   = '5';
-    const RELEASE_VERSION = '5';
-    const EXTRA_VERSION   = '';
+    const RELEASE_VERSION = '6';
+    const EXTRA_VERSION   = 'DEV';
 
     /**
      * Constructor.