diff --git a/Caddyfile b/Caddyfile
index 61ab4d4..b24b6b0 100644
--- a/Caddyfile
+++ b/Caddyfile
@@ -103,6 +103,7 @@ https://mail.msfjarvis.dev {
   }
   header / {
     -X-Content-Type-Options
+    -Content-Security-Policy
   }
 }