diff --git a/composer.json b/composer.json
index 1e40486..740e8b0 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
         "bin-dir": "bin/"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.7",
+        "phpunit/phpunit": "~4.7|~5.0",
         "symfony/http-foundation": "^3.0"
     },
     "autoload": {