diff --git a/composer.json b/composer.json
index 5e629a3..34d4404 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
     },
     "require-dev": {
         "scrutinizer/ocular": "~1.1",
-        "squizlabs/php_codesniffer": "~2.3 || ~3.0"
+        "squizlabs/php_codesniffer": "~2.3 || ~3.0 || ~4.0"
     },
     "autoload": {
         "psr-4": {