diff --git a/app.js b/app.js
index 420c1163..87da26e8 100644
--- a/app.js
+++ b/app.js
@@ -298,14 +298,14 @@ addWhatappEventHandler();
 
 // service worker
 
-// if('serviceWorker' in navigator){
-//     window.addEventListener('load', () => {
-//     navigator.serviceWorker.register('/sw.js')
-//     .then( (reg)=>{ 
-//         console.log('service worker registered', reg)
-//     })
-//         .catch((err)=> console.log('Service worker not registered', err));
-//   });
+if('serviceWorker' in navigator){
+    window.addEventListener('load', () => {
+    navigator.serviceWorker.register('/sw.js')
+    .then( (reg)=>{ 
+        console.log('service worker registered', reg)
+    })
+        .catch((err)=> console.log('Service worker not registered', err));
+  });
         
-// }
+}
 
diff --git a/sw.js b/sw.js
index e1140aae..a08910de 100644
--- a/sw.js
+++ b/sw.js
@@ -1,7 +1,7 @@
 // #5
 
-const staticCacheName = 'site-static-v53';
-const dynamicCache = 'site-dynamic-v53';
+const staticCacheName = 'site-static-v54';
+const dynamicCache = 'site-dynamic-v54';
 
 const dynamicCacheSize = 30;