diff --git a/.travis.yml b/.travis.yml
index fbe1a93..492ad43 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,9 @@
 sudo: false
 language: node_js
 node_js:
+  - '8'
+  - '6'
+  - '4'
   - '3'
   - '2'
   - '1'
diff --git a/package.json b/package.json
index 8b45917..0180f59 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     "autod": "*",
     "eslint": "1",
     "istanbul": "*",
-    "mocha": "*"
+    "mocha": "3"
   },
   "homepage": "https://github.com/node-modules/default-user-agent",
   "repository": {