diff --git a/composer.json b/composer.json
index 6658ba6..0c86ad6 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
         "php": "^7.4.0|^8.0"
     },
     "require-dev" : {
-        "phpunit/phpunit": "^9.1.4"
+        "phpunit/phpunit": "^12.0.0"
     },
     "license": "MIT",
     "authors": [