diff --git a/data/conf/nginx/includes/site-defaults.conf b/data/conf/nginx/includes/site-defaults.conf
index 1d03e939..dec68c0b 100644
--- a/data/conf/nginx/includes/site-defaults.conf
+++ b/data/conf/nginx/includes/site-defaults.conf
@@ -13,14 +13,18 @@
   ssl_session_timeout 1d;
   ssl_session_tickets off;
 
-  add_header Strict-Transport-Security "max-age=15768000;";
+  add_header Strict-Transport-Security "max-age=15768000; preload";
   add_header X-Content-Type-Options nosniff;
-  add_header X-XSS-Protection "1; mode=block";
+  add_header X-XSS-Protection "0";
   add_header X-Robots-Tag none;
   add_header X-Download-Options noopen;
   add_header X-Frame-Options "SAMEORIGIN" always;
   add_header X-Permitted-Cross-Domain-Policies none;
   add_header Referrer-Policy strict-origin;
+  add_header Permissions-Policy "accelerometer=(), ambient-light-sensor=(), autoplay=(), battery=(), camera=(), clipboard-read=(), display-capture=(), document-domain=(), encrypted-media=(), fullscreen=(), geolocation=(), gyroscope=(), hid=(), idle-detection=(), interest-cohort=(), magnetometer=(), microphone=(), midi=(), payment=(), picture-in-picture=(), screen-wake-lock=(), serial=(), usb=(), sync-xhr=(), xr-spatial-tracking=()";
+  add_header Content-Security-Policy "default-src 'none'; connect-src 'self' https://api.github.com https://www.gravatar.com; font-src 'self' https://fonts.gstatic.com; img-src 'self' data: https://www.gravatar.com; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; frame-ancestors 'none'; upgrade-insecure-requests; block-all-mixed-content; base-uri 'none'";
+  add_header Cross-Origin-Opener-Policy same-origin;
+  add_header Cross-Origin-Resource-Policy same-origin;
 
   index index.php index.html;