diff --git a/composer.json b/composer.json
index 07872c0..45d669a 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
         "ext-pdo": "*"
     },
     "require-dev": {
-        "phpunit/phpunit": "^7.5 || ^8.0 || ^9.0",
+        "phpunit/phpunit": "^9.0",
         "php-coveralls/php-coveralls": "^2.0",
         "vimeo/psalm": "5.15.0"
     },