diff --git a/composer.json b/composer.json
index 6ac3e45..2d7aa54 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,11 @@
     "preferred-install": {
       "*": "dist"
     },
-    "sort-packages": true
+    "sort-packages": true,
+    "allow-plugins": {
+      "symfony/flex": true,
+      "symfony/runtime": true
+    }
   },
   "autoload": {
     "psr-4": {