diff --git a/composer.json b/composer.json
index 41f79d9..dd13718 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,7 @@
         "php": ">=5.6.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "10.5.8",
+        "phpunit/phpunit": "10.5.9",
         "squizlabs/php_codesniffer": "3.8.1"
     },
     "scripts": {