diff --git a/adr_viewer/templates/index.html b/adr_viewer/templates/index.html
index f2c0d5e..6f5639b 100644
--- a/adr_viewer/templates/index.html
+++ b/adr_viewer/templates/index.html
@@ -2,9 +2,9 @@
 <html lang="en">
     <head>
         <meta name="viewport" content="width=device-width, initial-scale=1">
-        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
-        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
-        <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
+        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
+        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
+        <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
         <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.2.0/css/all.css">
         <title>ADR Viewer - {{ config.project_title }}</title>
 
