diff --git a/.travis.yml b/.travis.yml
index e7a19e6..90ec10b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-  - "9"
+  - "8"
 dist: trusty   # needed for chrome headless
 sudo: required # needed for chrome headless
 addons:
diff --git a/package.json b/package.json
index bfd1dc7..783faf8 100644
--- a/package.json
+++ b/package.json
@@ -164,7 +164,10 @@
       "inline-script.js",
       "webpack.client.config.js",
       "webpack.server.config.js"
-    ]
+    ],
+    "engines": {
+      "node": "^8.0.0"
+    }
   },
   "greenkeeper": {
     "ignore": [