diff --git a/composer.json b/composer.json
index 3b387ef..28abad6 100644
--- a/composer.json
+++ b/composer.json
@@ -49,6 +49,9 @@
         "symfony/debug": "<3.3"
     },
     "extra": {
-        "flex-id": ""
+        "flex": {
+            "id": "",
+            "allow-contrib": false
+        }
     }
 }