diff --git a/composer.json b/composer.json
index ac4610d..cb4797b 100644
--- a/composer.json
+++ b/composer.json
@@ -24,6 +24,7 @@
     "doctrine/dbal": "~2.5",
     "nyholm/symfony-bundle-test": "~1.4",
     "phpunit/phpunit": "~5.0|~6.0|~7.0",
+    "squizlabs/php_codesniffer": "^3.5",
     "symfony/config": "~4.0",
     "symfony/dependency-injection": "~3.0|~4.0|~5.0",
     "symfony/framework-bundle": "~3.0|~4.0|~5.0",