diff --git a/conf/nginx.conf b/conf/nginx.conf
index 31c48c0..0d65772 100644
--- a/conf/nginx.conf
+++ b/conf/nginx.conf
@@ -39,4 +39,5 @@ location __PATH__/embed/ {
   proxy_set_header Connection "upgrade";
 
   more_set_headers "X-Frame-Options : ALLOWALL";
+  more_set_headers "Content-Security-Policy : upgrade-insecure-requests ; frame-ancestors * ";
 }