diff --git a/templates/index.html b/templates/index.html
index 56d8fa50..4d15dfb1 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -39,7 +39,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <meta
       http-equiv="Content-Security-Policy"
-      content="upgrade-insecure-requests"
+      content="default-src 'self' http: https: data: blob: 'unsafe-inline' 'unsafe-eval';"
     />
   </head>
   <body>
