diff --git a/package.json b/package.json
index 961abdf7..fc9d7b0a 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
   "homepage": "https://coriolis.edcd.io",
   "bugs": "https://github.com/EDCD/coriolis/issues",
   "private": true,
-  "engine": "node >= 4.0.0",
+  "engine": "node >= 4.8.1",
   "license": "MIT",
   "scripts": {
     "prepublish": "rollup -c && uglifyjs d3.js -c -m -o d3.min.js",