diff --git a/.travis.yml b/.travis.yml
index 3285e08..05eb789 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,8 @@
 language: node_js
 node_js:
-  - 4
-  - 6
-  - 8
\ No newline at end of file
+  - "node"
+  - "6"
+  - "7"
+  - "8"
+  - "9"
+  - "10"
diff --git a/test/base58.test.js b/test/base58.test.js
index 72f1c95..60e698e 100644
--- a/test/base58.test.js
+++ b/test/base58.test.js
@@ -1,6 +1,6 @@
-var assert = require("assert");
-var examples = require("./examples");
-var base58 = require("..");
+const assert = require("assert");
+const examples = require("./examples");
+const base58 = require("..");
 
 function exampleRunner(callback) {
   Object.keys(examples).forEach(function(str) {