diff --git a/_headers b/_headers
index 0995a4d..7466e31 100644
--- a/_headers
+++ b/_headers
@@ -1,3 +1,3 @@
 /*
-    Content-Security-Policy: default-src 'self'
+    Content-Security-Policy: default-src 'self'; frame-ancestors 'none'
     X-Content-Type-Options: nosniff
\ No newline at end of file