diff --git a/src/php/router.php b/src/php/router.php
index b2c776e..b823e54 100644
--- a/src/php/router.php
+++ b/src/php/router.php
@@ -130,7 +130,7 @@ switch ($view) {
       oldLoad && oldLoad();
       if (UpUp) {
         UpUp.start({
-          'cache-version': '2.1.0',
+          'cache-version': '2.1.1',
           'content-url': 'offline.html',
           'assets': [
             \"" . implode('","', $files) . "\"