diff --git a/app/include_header.php b/app/include_header.php
index 5828270..cb8b11c 100644
--- a/app/include_header.php
+++ b/app/include_header.php
@@ -91,12 +91,12 @@ $vendor_url = $server_url . 'assets/vendor/';
   <script defer src="<?php echo $vendor_url?>apexcharts/7.5.1/apexcharts.min.js"></script>
 
   <!-- theme script  -->
-  <link rel="stylesheet" href="<?php echo $server_url?>assets/css/main.css">
-  <script type="module" src="<?php echo $server_url?>assets/js/main.js"></script>
-  <link rel="stylesheet" href="<?php echo $server_url?>assets/css/custom.css">
+  <link rel="stylesheet" href="<?php echo $server_url?>assets/css/main.css?v=<?php echo @filemtime(__DIR__ . '/assets/css/main.css'); ?>">
+  <script type="module" src="<?php echo $server_url?>assets/js/main.js?v=<?php echo @filemtime(__DIR__ . '/assets/js/main.js'); ?>"></script>
+  <link rel="stylesheet" href="<?php echo $server_url?>assets/css/custom.css?v=<?php echo @filemtime(__DIR__ . '/assets/css/custom.css'); ?>">
   <script src="<?php echo $server_url?>assets/js/ajax_core.js?v=<?php echo @filemtime(__DIR__ . '/assets/js/ajax_core.js'); ?>"></script>
   <script src="<?php echo $server_url?>assets/js/custom.js?v=<?php echo @filemtime(__DIR__ . '/assets/js/custom.js'); ?>"></script>
-  <script src="<?php echo $server_url?>assets/js/batch_overlay.js"></script>
+  <script src="<?php echo $server_url?>assets/js/batch_overlay.js?v=<?php echo @filemtime(__DIR__ . '/assets/js/batch_overlay.js'); ?>"></script>
 
   <!-- camera scanner library, loaded lazily by scanner.js when the camera opens -->
   <script defer src="<?php echo $vendor_url?>html5-qrcode/2.3.8/html5-qrcode.min.js"></script>
diff --git a/app/login/include_login_header.php b/app/login/include_login_header.php
index 918f83e..1ce44bf 100644
--- a/app/login/include_login_header.php
+++ b/app/login/include_login_header.php
@@ -37,8 +37,8 @@ $vendor_url = $server_url . 'assets/vendor/';
   <script src="<?php echo $vendor_url?>loadingoverlay/2.1.7/loadingoverlay.min.js"></script>
 
   <link href="<?php echo $vendor_url?>bootstrap/5.3.8/bootstrap.min.css" rel="stylesheet">
-  <link rel="stylesheet" href="<?php echo $server_url?>assets/css/main.css">
-  <link rel="stylesheet" href="<?php echo $server_url?>assets/css/custom.css">
+  <link rel="stylesheet" href="<?php echo $server_url?>assets/css/main.css?v=<?php echo @filemtime(__DIR__ . '/../assets/css/main.css'); ?>">
+  <link rel="stylesheet" href="<?php echo $server_url?>assets/css/custom.css?v=<?php echo @filemtime(__DIR__ . '/../assets/css/custom.css'); ?>">
 
   <script>var server_url = <?php echo json_encode($server_url); ?>;</script>
   <script src="<?php echo $server_url?>assets/js/ajax_core.js?v=<?php echo @filemtime(__DIR__ . '/../assets/js/ajax_core.js'); ?>"></script>