diff --git a/composer.json b/composer.json
index e89dc7a..cd976b7 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
         }
     },
     "require": {
-        "phpunit/phpunit": "^6.4",
+        "phpunit/phpunit": "^6.4|^7.0",
         "symfony/expression-language": "^3.3"
     }
 }