diff --git a/wp-h5p-xapi.php b/wp-h5p-xapi.php
index 8f92a2d..2ea79eb 100644
--- a/wp-h5p-xapi.php
+++ b/wp-h5p-xapi.php
@@ -19,10 +19,10 @@
 
 function h5pxapi_enqueue_scripts()
 {
-    wp_register_script("wp-h5p-xapi", plugins_url() . "/wp-h5p-xapi/wp-h5p-xapi.js", array("jquery"));
+    wp_register_script("wp-h5p-xapi", plugins_url() . "/wp-h5p-xapi/wp-h5p-xapi.js", array("jquery"), filemtime(__FILE__ ), true);
     wp_enqueue_script("wp-h5p-xapi");
 
-    wp_register_style("wp-h5p-xapi", plugins_url() . "/wp-h5p-xapi/wp-h5p-xapi.css");
+    wp_register_style("wp-h5p-xapi", plugins_url() . "/wp-h5p-xapi/wp-h5p-xapi.css", array(), filemtime(__FILE__ ), 'all');
     wp_enqueue_style("wp-h5p-xapi");
 
     $xapi_js_settings = array();