diff --git a/composer.json b/composer.json
index 937dd74..feb9910 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
   },
   "require-dev": {
     "symfony/var-dumper": "*",
-    "phpunit/phpunit": "^5.2",
+    "phpunit/phpunit": "^5.2 || ^8.0",
     "symfony/http-foundation": "^3.3"
   }
 }