diff --git a/composer.json b/composer.json
index 137c0ff..e55140f 100644
--- a/composer.json
+++ b/composer.json
@@ -17,6 +17,7 @@
     ],
     "require": {
         "bummzack/sortablefile": "^2.0",
+        "dynamic/silverstripe-collection": "^3.0",
         "silverstripe/recipe-cms": "^5",
         "symbiote/silverstripe-gridfieldextensions": "^4.0"
     },