diff --git a/composer.json b/composer.json
index e512446..657a5b4 100644
--- a/composer.json
+++ b/composer.json
@@ -37,5 +37,11 @@
     "scripts": {
         "phpstan": "./vendor/bin/phpstan analyze",
         "test": "phpunit"
+    },
+    "config": {
+        "allow-plugins": {
+            "ocramius/package-versions": true,
+            "phpstan/extension-installer": true
+        }
     }
 }