diff --git a/metadata.json b/metadata.json
index df53e83..30fdafa 100644
--- a/metadata.json
+++ b/metadata.json
@@ -26,6 +26,10 @@
     {
       "name": "puppetlabs/stdlib",
       "version_requirement": ">= 1.0.0"
+    },
+    {
+      "name": "puppetlabs/concat",
+      "version_requirement": ">= 1.2.1"
     }
   ]
 }