diff --git a/src/main/resources/static/img/403.gif b/src/main/resources/static/img/403.gif
new file mode 100644
index 0000000..04c80e7
Binary files /dev/null and b/src/main/resources/static/img/403.gif differ
diff --git a/src/main/resources/static/img/403.webp b/src/main/resources/static/img/403.webp
deleted file mode 100644
index 4429525..0000000
Binary files a/src/main/resources/static/img/403.webp and /dev/null differ
diff --git a/src/main/resources/static/sw.js b/src/main/resources/static/sw.js
index ee1d708..8534f0b 100644
--- a/src/main/resources/static/sw.js
+++ b/src/main/resources/static/sw.js
@@ -16,6 +16,7 @@ var urlsToCache = [
 
 self.addEventListener('install', function (event) {
     // Perform install steps
+    self.skipWaiting();
     event.waitUntil(
         caches.open(CACHE_NAME)
             .then(function (cache) {
diff --git a/src/main/resources/templates/error/403.html b/src/main/resources/templates/error/403.html
index df3be09..caf2ea3 100644
--- a/src/main/resources/templates/error/403.html
+++ b/src/main/resources/templates/error/403.html
@@ -58,7 +58,7 @@
                 <h6 class=" blue-grey-text ">403 – Forbidden</h6>
             </div>
             <div class="col l6 m12 s12">
-                <img class="" src="/img/403.webp" style="border:none;outline: none"/>
+                <img class="" src="/img/403.gif" style="border:none;outline: none"/>
             </div>
         </div>
         <div class="row">