diff --git a/composer.json b/composer.json
index 87340fb..88aa32f 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
         "dnadesign/silverstripe-elemental": "^4.0"
     },
     "require-dev": {
-        "phpunit/PHPUnit": "^5.7",
+        "phpunit/phpunit": "^5.7",
         "squizlabs/php_codesniffer": "*"
     },
     "autoload": {