diff --git a/engine/Engine.php b/engine/Engine.php
index 79531d96..f5c730ea 100644
--- a/engine/Engine.php
+++ b/engine/Engine.php
@@ -25,7 +25,7 @@
 namespace ZK\Engine;
 
 class Engine {
-    const VERSION = "2.2.0-DEV";
+    const VERSION = "2.2.0";
 
     private static $apis;
     private static $config;