diff --git a/src/Eccube/Common/Constant.php b/src/Eccube/Common/Constant.php
index 32cead8c23a..ee7d4158cae 100644
--- a/src/Eccube/Common/Constant.php
+++ b/src/Eccube/Common/Constant.php
@@ -28,7 +28,7 @@ class Constant
     /**
      * EC-CUBE VERSION.
      */
-    const VERSION = '3.1-alpha2';
+    const VERSION = '3.n-alpha4';
 
     /**
      * Enable value.