diff --git a/src/Symfony/Component/HttpKernel/Kernel.php b/src/Symfony/Component/HttpKernel/Kernel.php
index 0df231dca9..6ec1c85f7e 100644
--- a/src/Symfony/Component/HttpKernel/Kernel.php
+++ b/src/Symfony/Component/HttpKernel/Kernel.php
@@ -73,12 +73,12 @@ abstract class Kernel implements KernelInterface, RebootableInterface, Terminabl
 
     private static $freshCache = [];
 
-    const VERSION = '5.1.0';
-    const VERSION_ID = 50100;
+    const VERSION = '5.1.1-DEV';
+    const VERSION_ID = 50101;
     const MAJOR_VERSION = 5;
     const MINOR_VERSION = 1;
-    const RELEASE_VERSION = 0;
-    const EXTRA_VERSION = '';
+    const RELEASE_VERSION = 1;
+    const EXTRA_VERSION = 'DEV';
 
     const END_OF_MAINTENANCE = '01/2021';
     const END_OF_LIFE = '01/2021';