diff --git a/Caddyfile b/Caddyfile
index 5cd8f6d..b0df1eb 100644
--- a/Caddyfile
+++ b/Caddyfile
@@ -6,6 +6,13 @@
 :80 {
   encode zstd gzip
 
+  header {
+    X-Frame-Options "DENY"
+    X-Content-Type-Options "nosniff"
+    Referrer-Policy "strict-origin-when-cross-origin"
+    Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob:; font-src 'self' data:;"
+  }
+
   handle /mcp {
     reverse_proxy 127.0.0.1:3001
   }