diff --git a/composer.json b/composer.json
index a9e6656..4b96d76 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^7.0",
-        "mikey179/vfsStream": "^1.6"
+        "mikey179/vfsstream": "^1.6"
     },
     "autoload": {
         "psr-4": { "Rusty\\": "src/" }