diff --git a/composer.json b/composer.json
index 75de91e..16bc2f1 100644
--- a/composer.json
+++ b/composer.json
@@ -15,6 +15,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^5.7",
+        "silverstripe/versioned": "^1@dev",
         "squizlabs/php_codesniffer": "^3.0"
     },
     "extra": {