diff --git a/docker/resume/nginx.conf b/docker/resume/nginx.conf
index 52b6f19..8e0f4af 100644
--- a/docker/resume/nginx.conf
+++ b/docker/resume/nginx.conf
@@ -9,7 +9,11 @@ server {
     add_header Referrer-Policy "strict-origin-when-cross-origin" always;
     add_header Permissions-Policy "camera=(), microphone=(), geolocation=(), accelerometer=(), gyroscope=(), magnetometer=(), payment=(), usb=()" always;
 
-    add_header Content-Security-Policy "default-src 'none'; script-src 'self' https://matomo.nixc.us; style-src 'self' 'unsafe-inline' https://colinknapp.com; img-src 'self' https://matomo.nixc.us https://colinknapp.com; font-src 'self' data:; frame-ancestors 'self'; base-uri 'self'; form-action 'self';" always;
+    add_header Content-Security-Policy "default-src 'none'; script-src 'self' 'unsafe-inline' https://matomo.nixc.us; style-src 'self' 'unsafe-inline' https://colinknapp.com; img-src 'self' https://matomo.nixc.us https://colinknapp.com https://hedgedoc.nixc.us; font-src 'self' data:; frame-ancestors 'self'; base-uri 'self'; form-action 'self';" always;
+
+    sub_filter "https://demo.hedgedoc.org" "https://hedgedoc.nixc.us";
+    sub_filter_once off;
+    sub_filter_types text/html application/javascript;
 
     location / {
         try_files $uri $uri/ =404;