diff --git a/composer.json b/composer.json
index 40c44be..bb636b5 100644
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,7 @@
     "description": "Generate pure html files based on a PHP file and a mock.",
     "type": "library",
     "require-dev": {
-        "squizlabs/php_codesniffer": "3.5.5"
+        "squizlabs/php_codesniffer": "4.0.1"
     },
     "license": "MIT",
     "autoload": {