diff --git a/composer.json b/composer.json
index 3fe6bdf..012fa4d 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
         "league/oauth2-client": "~0.5"
     },
     "require-dev": {
-        "phpunit/phpunit" : "~4.3",
+        "phpunit/phpunit" : "~4.6",
         "mockery/mockery": "~0.9"
     },
     "autoload": {