diff --git a/src/web/client/main_menu.html b/src/web/client/main_menu.html
index ac12277..feb0b92 100644
--- a/src/web/client/main_menu.html
+++ b/src/web/client/main_menu.html
@@ -34,8 +34,8 @@
 		<script src="../../../resources/js/phaser.min.js"></script>
 
 		<!-- global source files -->
-		<script src="../../game/lib/session_storage_manager.js"></script>
-		<script src="../../game/lib/global/global_variables.js"></script>
+		<script src="../../game/lib/session_storage_manager.js?update=190915"></script>
+		<script src="../../game/lib/global/global_variables.js?update=190915"></script>
 
 		<!-- library source files -->
 		<script src="../../game/lib/color/main_color.js"></script>