diff --git a/composer.json b/composer.json
index e52a70a..8ce9965 100644
--- a/composer.json
+++ b/composer.json
@@ -29,7 +29,7 @@
         "phpstan/phpstan-deprecation-rules": "^0.11",
         "phpstan/phpstan-phpunit": "^0.11",
         "phpstan/phpstan-strict-rules": "^0.11",
-        "phpunit/phpunit": "^8.2",
+        "phpunit/phpunit": "^8.3",
         "zendframework/zend-diactoros": "^2.1"
     },
     "autoload": {