diff --git a/composer.json b/composer.json
index a32cedc..a954aa2 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
         "guzzlehttp/guzzle": "^7.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "9.5.10",
+        "phpunit/phpunit": "9.6.33",
         "squizlabs/php_codesniffer": "3.6.2"
     },
     "autoload": {