diff --git a/composer.json b/composer.json
index 6c46a9a..a225960 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
         "jakub-onderka/php-console-highlighter": "^0.3.2",
         "jakub-onderka/php-parallel-lint": "^1.0",
         "phpunit/php-invoker": "^1.1|^2.0",
-        "phpunit/phpunit": "^6.5",
+        "phpunit/phpunit": "^6.5|^7.0",
         "squizlabs/php_codesniffer": "^3.2"
     },
     "autoload": {