diff --git a/composer.json b/composer.json
index 5a2aaba..829fe40 100644
--- a/composer.json
+++ b/composer.json
@@ -23,8 +23,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "4.2.*",
-        "ext-xdebug": "*",
-        "mikey179/vfsStream": "1.3.*@dev",
+        "mikey179/vfsStream": "1.4.*@dev",
         "satooshi/php-coveralls": "dev-master",
         "phpunit/phpcov": "dev-master",
         "phpunit/phpunit-story": "*"