diff --git a/conf/nginx.conf b/conf/nginx.conf
index 585109e..eb823e7 100644
--- a/conf/nginx.conf
+++ b/conf/nginx.conf
@@ -1,6 +1,9 @@
 # upload max size
 client_max_body_size 100M;
 
+# Content Security Policy : security to avoid launching unsecure script
+add_header Content-Security-Policy "default-src 'none'; font-src 'self'; media-src 'self'; style-src 'self' 'unsafe-inline'; script-src 'self'; img-src 'self' blob: data:; connect-src 'self' wss://$domain;";
+
 # add to v1.4 assets
 root __FINALPATH__/live/public;