diff --git a/composer.json b/composer.json
index 89aea6f..eecbdfb 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
 	},
 	"require-dev": {
 		"mikey179/vfsstream": "1.6.*",
-        "phpunit/phpunit": "^9.6",
+        "phpunit/phpunit": "^12.0",
         "kenjis/ci-phpunit-test": "^3.0"
 	},
     "config": {