diff --git a/package.json b/package.json
index 2e393b5..b6d8b64 100644
--- a/package.json
+++ b/package.json
@@ -29,5 +29,5 @@
   },
   "main": "./lib/winston-loggly",
   "scripts": { "test": "vows --spec" },
-  "engines": { "node": ">= 5.0.0" }
+  "engines": { "node": ">= 6.4.0" }
 }