diff --git a/composer.json b/composer.json
index fac7ffb..42ea2c1 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     },
     "require-dev": {
         "phpstan/phpstan": "^2.0",
-        "phpunit/phpunit": "^9.3 || ^10.0",
+        "phpunit/phpunit": "^9.3 || ^10.0 || ^12.0",
         "squizlabs/php_codesniffer": "^3.5.0 || ^4.0.0"
     },
     "autoload": {