diff --git a/composer.json b/composer.json
index ed1147513cafcf874a807c244ed1a5d01a84933e..3b9fa4ca804a59d1dd4bb39427c4ba494168e1e8 100644
--- a/composer.json
+++ b/composer.json
@@ -37,6 +37,7 @@
     "roave/security-advisories": "dev-latest",
     "phan/phan": "4.x",
     "phpstan/phpstan": "^0.12.83",
-    "phpunit/phpunit": "^9"
+    "phpunit/phpunit": "^9",
+    "squizlabs/php_codesniffer": "3.*"
   }
 }