diff --git a/composer.json b/composer.json
index 705058c..5597741 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,7 @@
         "silverstripe/raygun": "2.1.0"
     },
     "require-dev": {
-        "phpunit/PHPUnit": "^5.7",
+        "phpunit/phpunit": "^5.7",
         "phpunit/php-token-stream": "^1.4.2",
         "phpdocumentor/reflection-docblock": "^3.0.2",
         "squizlabs/php_codesniffer": "^3.4",