diff --git a/static/html/epub.html b/static/html/epub.html
index e81f343..0b9816a 100644
--- a/static/html/epub.html
+++ b/static/html/epub.html
@@ -8,9 +8,9 @@
         <meta name="viewport" content="width=device-width, user-scalable=no">
         <meta name="apple-mobile-web-app-capable" content="yes">
 
-        <link rel="stylesheet" href="/static/epub.js/css/normalize.css">
-        <link rel="stylesheet" href="/static/epub.js/css/main.css">
-        <link rel="stylesheet" href="/static/epub.js/css/popup.css">
+        <link rel="stylesheet" href="/static/epub.js/css/normalize.css?2">
+        <link rel="stylesheet" href="/static/epub.js/css/main.css?2">
+        <link rel="stylesheet" href="/static/epub.js/css/popup.css?2">
         <style>
             .arrow {
                 -webkit-user-select: none;