diff --git a/lib/Controller.php b/lib/Controller.php
index b6cd1e8c..a6fd0a5b 100644
--- a/lib/Controller.php
+++ b/lib/Controller.php
@@ -342,6 +342,7 @@ class Controller
         header('Cross-Origin-Resource-Policy: same-origin');
         header('Cross-Origin-Embedder-Policy: require-corp');
         header('Cross-Origin-Opener-Policy: same-origin');
+        header('Permissions-Policy: browsing-topics=()');
         header('Referrer-Policy: no-referrer');
         header('X-Content-Type-Options: nosniff');
         header('X-Frame-Options: deny');