diff --git a/engine/Engine.php b/engine/Engine.php
index 726a8f42..41fb2c49 100644
--- a/engine/Engine.php
+++ b/engine/Engine.php
@@ -25,7 +25,7 @@
 namespace ZK\Engine;
 
 class Engine {
-    const VERSION = "2.4.0-DEV";
+    const VERSION = "2.4.0";
 
     private static $apis;
     private static $config;