diff --git a/composer.json b/composer.json
index 7ad0c17..6bba2d3 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
         "php": "^7.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^6.5.5",
+        "phpunit/phpunit": "^7.0",
         "symfony/phpunit-bridge": "^4.0"
     },
     "autoload": {