diff --git a/Kernel.php b/Kernel.php
index 578d976fdb..e3004cf4f7 100644
--- a/Kernel.php
+++ b/Kernel.php
@@ -78,12 +78,12 @@ abstract class Kernel implements KernelInterface, RebootableInterface, Terminabl
      */
     private static $freshCache = [];
 
-    public const VERSION = '5.4.8';
-    public const VERSION_ID = 50408;
+    public const VERSION = '5.4.9-DEV';
+    public const VERSION_ID = 50409;
     public const MAJOR_VERSION = 5;
     public const MINOR_VERSION = 4;
-    public const RELEASE_VERSION = 8;
-    public const EXTRA_VERSION = '';
+    public const RELEASE_VERSION = 9;
+    public const EXTRA_VERSION = 'DEV';
 
     public const END_OF_MAINTENANCE = '11/2024';
     public const END_OF_LIFE = '11/2025';