diff --git a/composer.json b/composer.json
index f521e9a..3af08b8 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
         "phpmd/phpmd": "^2.6",
         "phpunit/phpunit": "^5.7",
         "sebastian/phpcpd": "^3.0",
-        "squizlabs/php_codesniffer": "^3.1"
+        "squizlabs/php_codesniffer": "^2.9"
     },
     "autoload": {
         "psr-4": {