diff --git a/composer.json b/composer.json
index 57d26e8..c0e4995 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     "rmccue/requests": ">=1.0"
   },
   "require-dev": {
-      "phpunit/phpunit": "4.4.*"
+      "phpunit/phpunit": "4.4.* || 4.8.*"
   },
   "autoload": {
     "classmap": ["lib/Culqi/"]