composer require --dev phpstan/phpstan #16

Author: gregor-j

composer.json

@@ -27,6 +27,7 @@
         "tests": "vendor/bin/phpunit"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.6"
+        "phpunit/phpunit": "^9.6",
+        "phpstan/phpstan": "^2.1"
     }
 }