diff --git a/README.md b/README.md
index a35ee159..8e042534 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ pelias-whosonfirst is a tool used for importing [Who's On First data](https://wh
 
 ## Requirements
 
-Node.js 4 or higher is required
+Node.js 4 or 6 (the latest in the 4 series is currently recommended).
 
 ## Types
 
diff --git a/package.json b/package.json
index 665b4031..bb06a978 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "pelias-whosonfirst",
   "version": "0.0.0-semantic-release",
   "engines": {
-    "node": ">=4.0.0"
+    "node": ">=4.0.0 <8.0.0"
   },
   "description": "Importer for Who's on First",
   "main": "index.js",