diff --git a/composer.json b/composer.json
index 749c6bc..94e9bf9 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
     "ext-zlib": "*"
   },
   "require-dev": {
-    "phpunit/phpunit": "~9.5.4",
+    "phpunit/phpunit": "~9.6.33",
     "phpstan/phpstan": "~0.12.88",
     "vimeo/psalm": "~4.7.2"
   },