diff --git a/composer.json b/composer.json
index 4c25deb..2d5417a 100644
--- a/composer.json
+++ b/composer.json
@@ -25,6 +25,7 @@
         "php-webdriver/webdriver": "^1.6",
         "squizlabs/php_codesniffer": "3.*",
         "friendsofphp/php-cs-fixer": "^2.0",
+        "phpstan/phpstan": "^0.12",
         "symfony/yaml": "^5.1.0",
         "psr/container": "^1.0",
         "psr/cache": "^1.0",