diff --git a/resources/views/layout/header.blade.php b/resources/views/layout/header.blade.php
index 738ef76..b80a8d4 100644
--- a/resources/views/layout/header.blade.php
+++ b/resources/views/layout/header.blade.php
@@ -43,7 +43,7 @@
     <link rel="stylesheet" href="{{ asset('assets/vendor/libs/pickr/pickr-themes.css') }}" />
 
     <link rel="stylesheet" href="{{ asset('assets/vendor/css/core.css') }}" />
-    <link rel="stylesheet" href="{{ asset('assets/css/demo.css') }}" />
+    <link rel="stylesheet" href="{{ asset('assets/css/demo.css') }}?v={{ filemtime(public_path('assets/css/demo.css')) }}" />
 
     <link rel="stylesheet" href="{{ asset('assets/vendor/libs/perfect-scrollbar/perfect-scrollbar.css') }}" />