diff --git a/src/service-worker.js b/src/service-worker.js
index aa4dc00..fdf16cf 100644
--- a/src/service-worker.js
+++ b/src/service-worker.js
@@ -1,4 +1,4 @@
-var CACHE = 'v1';
+var CACHE = 'v2';
 
 self.addEventListener('fetch', function(event) {
   event.respondWith(fetchAndCache(event));
@@ -7,7 +7,7 @@ self.addEventListener('fetch', function(event) {
 function cacheBust(request) {
   var url = request.url;
   if (url.indexOf(self.location.origin) >= 0) {
-    if (url.indexOf('.') < 0) {
+    if (url[url.length - 1] !== '/' && (url.indexOf('.') < 0 || url.lastIndexOf('.') < self.location.origin.length)) {
       url += `/`;
     }
     return `${url}?${Math.random()}`;