diff --git a/metadata.json b/metadata.json
index fe531d1c..476d8845 100644
--- a/metadata.json
+++ b/metadata.json
@@ -21,7 +21,7 @@
     },
     {
       "name": "puppetlabs/concat",
-      "version_requirement": ">= 1.0.0 < 5.0.0"
+      "version_requirement": ">= 1.0.0 < 6.0.0"
     },
     {
       "name": "puppetlabs/hocon",