diff --git a/volumes/conf.d/zinomedia.de.conf b/volumes/conf.d/zinomedia.de.conf
index 04ef3d2..03559a9 100644
--- a/volumes/conf.d/zinomedia.de.conf
+++ b/volumes/conf.d/zinomedia.de.conf
@@ -15,7 +15,7 @@ server {
     include "snippets/ssl-optimizations.conf";
     include "snippets/wordpress-optimizations.conf";
 
-    add_header Content-Security-Policy "default-src *; script-src 'self' 'unsafe-inline' 'unsafe-eval' blob:; img-src 'self' data: *; style-src 'self' 'unsafe-inline'; font-src 'self' data: *;" always;
+    add_header Content-Security-Policy "default-src *; script-src 'self' 'unsafe-inline' 'unsafe-eval' blob:; img-src 'self' data: *; style-src 'self' 'unsafe-inline'; font-src 'self' data: *; upgrade-insecure-requests;" always;
 
     client_max_body_size 0;