diff --git a/composer.json b/composer.json
index 8346322..5265e10 100644
--- a/composer.json
+++ b/composer.json
@@ -57,7 +57,7 @@
     "ext-json": "*"
   },
   "require-dev": {
-    "phpunit/phpunit": "^9.6",
+    "phpunit/phpunit": "^12.0",
     "squizlabs/php_codesniffer": "^3.7",
     "phpstan/phpstan": "^1.10",
     "friendsofphp/php-cs-fixer": "^3.16"