diff --git a/composer.json b/composer.json
index d958b5b..eb3a32e 100644
--- a/composer.json
+++ b/composer.json
@@ -33,7 +33,7 @@
         "phpstan/phpstan": "^0.9",
         "phpstan/phpstan-phpunit": "^0.9",
         "phpstan/phpstan-strict-rules": "^0.9.0",
-        "phpunit/phpunit": "^6.0"
+        "phpunit/phpunit": "^6.0 || ^7.0"
     },
     "autoload": {
         "psr-4": {