Index: overall_startheader.tpl
@@ -15,8 +15,8 @@
 		<link rel="apple-touch-icon" href="icon-152x152.png">
 		<link rel="stylesheet" href="{THEME_DIR_PATH}css/bootstrap.min.css">
 		<link rel="stylesheet" href="{THEME_DIR_PATH}css/font-awesome.min.css">
-		<link rel="stylesheet" href="{THEME_DIR_PATH}css/style.css">
-		<link rel="stylesheet" href="{THEME_DIR_PATH}css/custom.css">
+		<link rel="stylesheet" href="{THEME_DIR_PATH}css/style.css?version={VERSION}">
+		<link rel="stylesheet" href="{THEME_DIR_PATH}css/custom.css?version={VERSION}">
 
 <!-- BEGIN dynamicJSHeader -->
                <script type="text/javascript" src="{dynamicJSHeader.FILENAME}"></script>