diff --git a/composer.json b/composer.json
index b50d0e0..345a690 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
   "require-dev": {
     "ergebnis/composer-normalize": "2.41.1",
     "phpstan/phpstan": "1.10.56",
-    "phpunit/phpunit": "10.5.8",
+    "phpunit/phpunit": "10.5.9",
     "roave/security-advisories": "dev-latest"
   },
   "autoload": {