diff --git a/composer.json b/composer.json
index be08125..4f31724 100644
--- a/composer.json
+++ b/composer.json
@@ -22,6 +22,6 @@
         "docs": "php vendor/bin/phpdoc-md generate src > docs.md",
         "lint": "php vendor/bin/phpcs --standard=PSR12 src",
         "lint-fix": "php vendor/bin/phpcbf --standard=PSR12 src",
-        "phpstan": "php vendor/bin/phpstan analyse src --level=9"
+        "phpstan": "php vendor/bin/phpstan analyse"
     }
 }
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..ffdbd91
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,4 @@
+parameters:
+  level: 9
+  paths:
+    - src