diff --git a/composer.json b/composer.json
index 1e26abf..848d903 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
         "phpstan/phpstan-deprecation-rules": "^0.11",
         "phpstan/phpstan-phpunit": "^0.11",
         "phpstan/phpstan-strict-rules": "^0.11",
-        "phpunit/phpunit": "^8.4"
+        "phpunit/phpunit": "^8.5"
     },
     "autoload": {
         "psr-4": {