diff --git a/composer.json b/composer.json
index 2238d22..ac206bd 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,7 @@
     "psr/log": "^1.1"
   },
   "require-dev": {
-    "phpunit/phpunit": "9.5.9",
+    "phpunit/phpunit": "9.6.15",
     "squizlabs/php_codesniffer": "3.6.0",
     "php-coveralls/php-coveralls": "2.4.3",
     "vimeo/psalm": "4.10.0",