diff --git a/copyparty/web/browser.js b/copyparty/web/browser.js
index 9a1ea033..cc6e786e 100644
--- a/copyparty/web/browser.js
+++ b/copyparty/web/browser.js
@@ -7284,7 +7284,7 @@ function sandbox(tgt, rules, cls, html) {
 	html = '<html class="iframe ' + document.documentElement.className + '"><head><style>' + globalcss() +
 		'</style><base target="_parent"></head><body id="b" class="logue ' + cls + '">' + html +
 		'<script>' + env + '</script>' + sandboxjs() +
-		'<script>var d=document.documentElement,' +
+		'<script>var d=document.documentElement,TS="' + TS + '",' +
 		'loc=new URL("' + location.href.split('?')[0] + '");' +
 		'function say(m){window.parent.postMessage(m,"*")};' +
 		'setTimeout(function(){var its=0,pih=-1,f=function(){' +
diff --git a/copyparty/web/util.js b/copyparty/web/util.js
index 286339e4..6a8a905c 100644
--- a/copyparty/web/util.js
+++ b/copyparty/web/util.js
@@ -364,7 +364,7 @@ function import_js(url, cb, ecb) {
     var head = document.head || document.getElementsByTagName('head')[0];
     var script = mknod('script');
     script.type = 'text/javascript';
-    script.src = url;
+    script.src = url + '?_=' + (window.TS || 'a');
     script.onload = cb;
     script.onerror = ecb || function () {
         var m = 'Failed to load module:\n' + url;
