diff --git a/src/Symfony/Component/HttpKernel/Kernel.php b/src/Symfony/Component/HttpKernel/Kernel.php
index 51ac51c64c..de7b1a46fd 100644
--- a/src/Symfony/Component/HttpKernel/Kernel.php
+++ b/src/Symfony/Component/HttpKernel/Kernel.php
@@ -58,12 +58,12 @@ abstract class Kernel implements KernelInterface, TerminableInterface
     protected $startTime;
     protected $loadClassCache;
 
-    const VERSION = '2.3.39';
-    const VERSION_ID = 20339;
+    const VERSION = '2.3.40-DEV';
+    const VERSION_ID = 20340;
     const MAJOR_VERSION = 2;
     const MINOR_VERSION = 3;
-    const RELEASE_VERSION = 39;
-    const EXTRA_VERSION = '';
+    const RELEASE_VERSION = 40;
+    const EXTRA_VERSION = 'DEV';
 
     /**
      * Constructor.