diff --git a/main.go b/main.go
index 8ce5285..d1597e1 100644
--- a/main.go
+++ b/main.go
@@ -30,7 +30,7 @@ func Serve(w http.ResponseWriter, r *http.Request) {
   <head>
     <title>` + title + `</title>
     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
-    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
+    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
     <style>.table > tbody > tr > th, .table > tbody > tr > td { vertical-align: middle; }
 td.danger { text-align: center; }
 </style>
