diff --git a/composer.json b/composer.json
index f26f435..620e665 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
     ],
     "require": {
         "php": "^5.5 || ^7.0",
-        "phpunit/phpunit": "^4.0 || ^5.3 || ^6.0 || ^7.0"
+        "phpunit/phpunit": "^4.0 || ^5.3 || ^6.0 || ^7.0 || ^8.0"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^2.12"