diff --git a/package.json b/package.json
index 842a7e46..9b305cc2 100644
--- a/package.json
+++ b/package.json
@@ -42,5 +42,8 @@
     "highlight.js": "^9.13.1",
     "html-entities": "^1.2.1",
     "striptags": "^2.1.1"
+  },
+  "engines": {
+    "node": ">=6.9.0"
   }
 }