diff --git a/composer.json b/composer.json
index 8ba38f03be..2bd42baa75 100644
--- a/composer.json
+++ b/composer.json
@@ -117,6 +117,10 @@
         "sort-packages": true,
         "preferred-install": {
             "ezsystems/*": "dist"
+        },
+        "allow-plugins": {
+            "composer/package-versions-deprecated": true,
+            "symfony/thanks": true
         }
     },
     "extra": {