diff --git a/composer.json b/composer.json
index 99ce60a..ebfbcf8 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
     },
     "require-dev": {
         "jasny/php-code-quality": "^2.0",
-        "mikey179/vfsStream": "^1.6"
+        "mikey179/vfsstream": "^1.6"
     },
     "provide": {
         "psr/http-message-implementation": "~1.0.0"