diff --git a/serviceWorker.js b/serviceWorker.js
index 804916c..76e66b6 100644
--- a/serviceWorker.js
+++ b/serviceWorker.js
@@ -19,4 +19,21 @@ self.addEventListener("fetch", event => {
         return response || fetch(event.request);
       }),
   );
-});
\ No newline at end of file
+});
+
+// eslint-disable-next-line no-restricted-globals
+self.addEventListener('activate', function(e) {
+  e.waitUntil(
+    Promise.all(
+      caches.keys().then(cacheNames => {
+        return cacheNames.map(name => {
+          if (name !== cacheStorageKey) {
+            return caches.delete(name)
+          }
+        })
+      })
+    ).then(() => {
+      return self.clients.claim()
+    })
+  )
+})
\ No newline at end of file