diff --git a/serviceWorker.js b/serviceWorker.js
index f87620f..e4d31da 100644
--- a/serviceWorker.js
+++ b/serviceWorker.js
@@ -1,4 +1,6 @@
-var APP_SHELL_CACHE = "inventur_shell-v2";
+
+var APP_SHELL_VERSION = 2;
+var APP_SHELL_CACHE = "inventur_shell-${APP_SHELL_VERSION}";
 var urlsToCache = [
     'css/lib/materialize.min.css',
     'js/lib/materialize.min.js',