diff --git a/tools/phpstan/composer.json b/tools/phpstan/composer.json
index 87f1943..1dfe1b2 100644
--- a/tools/phpstan/composer.json
+++ b/tools/phpstan/composer.json
@@ -8,6 +8,9 @@
         "preferred-install": {
             "*": "dist"
         },
-        "sort-packages": true
+        "sort-packages": true,
+        "allow-plugins": {
+            "phpstan/extension-installer": true
+        }
     }
 }