diff --git a/edit-mode/function/ganttConfig.js b/edit-mode/function/ganttConfig.js
index ec68930..e3cfd62 100644
--- a/edit-mode/function/ganttConfig.js
+++ b/edit-mode/function/ganttConfig.js
@@ -747,6 +747,7 @@ gantt.config.smart_rendering = true;
 
 // drag process
 gantt.config.drag_progress = false;
+gantt.config.sort = true;
 
 // gantt initialization
 $(document).ready(function () {