diff --git a/docker/caddy/Caddyfile b/docker/caddy/Caddyfile
index 7c4b632d..fa9cde86 100644
--- a/docker/caddy/Caddyfile
+++ b/docker/caddy/Caddyfile
@@ -5,7 +5,11 @@ korhonen.cc, *.korhonen.cc {
 	}
 
 	header {
-		Strict-Transport-Security "max-age=31536000; includeSubDomains; preload"
+		Strict-Transport-Security "max-age=63072000; includeSubDomains; preload"
+		X-Frame-Options DENY
+		X-XSS-Protection 0
+		X-Content-Type-Options nosniff
+		Referrer-Policy strict-origin-when-cross-origin
 	}
 
 	@homepage host korhonen.cc