diff --git a/composer.json b/composer.json
index 354e2ca..6b0fd5d 100644
--- a/composer.json
+++ b/composer.json
@@ -31,7 +31,7 @@
         "symfony/process": "^4.4||^5.0||^6.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.5",
+        "phpunit/phpunit": "^9.5.16",
         "phpstan/phpstan": "^1.0",
         "friendsofphp/php-cs-fixer": "^3.0"
     },