diff --git a/composer.json b/composer.json
index a0661b491..86fb6e3f1 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
     },
     "require-dev": {
         "phpunit/php-code-coverage": "~2.0",
-        "phpunit/phpunit": "4.*"
+        "phpunit/phpunit": "~4.0|~5.0"
     },
     "autoload": {
         "psr-4": {