diff --git a/composer.json b/composer.json
index 2a6e6a8..91e877d 100644
--- a/composer.json
+++ b/composer.json
@@ -31,7 +31,7 @@
     "widmogrod/php-functional": "^6.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^8.2.3|^9.4.2",
+    "phpunit/phpunit": "^9.5.10",
     "phpbench/phpbench": "1.0.0-alpha2",
     "vlucas/phpdotenv": "~2.4",
     "symfony/serializer": "^3.4|^4.3",