diff --git a/metadata.json b/metadata.json
index dcadf2b..ee76472 100644
--- a/metadata.json
+++ b/metadata.json
@@ -27,8 +27,8 @@
     }
   ],
   "dependencies": [
-    { "name": "puppetlabs/stdlib" },
-    { "name": "puppetlabs/concat", "version_requirement": ">=2.0.0" }
+    { "name": "puppetlabs/stdlib", "version_requirement": ">=4.15 < 5.0.0" },
+    { "name": "puppetlabs/concat", "version_requirement": ">=2.0.0 < 3.0.0" }
   ],
   "data_provider": "hiera"
 }