diff --git a/composer.json b/composer.json
index c81eb07..4f2dd18 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
         "php": "^7.0"
     },
     "conflict": {
-        "phpunit/phpunit": "<6.0 || >6.5"
+        "phpunit/phpunit": "<6.0 || >=7.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^6.0"