diff --git a/javascript/node/selenium-webdriver/lib/test/build.js b/javascript/node/selenium-webdriver/lib/test/build.js
index 0b1c4d1a53728..f3a83f0028946 100644
--- a/javascript/node/selenium-webdriver/lib/test/build.js
+++ b/javascript/node/selenium-webdriver/lib/test/build.js
@@ -20,7 +20,6 @@
 const fs = require('fs')
 const path = require('path')
 const { spawn } = require('child_process')
-
 const PROJECT_ROOT = path.normalize(path.join(__dirname, '../../../../..'))
 const WORKSPACE_FILE = path.join(PROJECT_ROOT, 'WORKSPACE')
 
@@ -38,14 +37,14 @@ function checkIsDevMode() {
  * Targets that have been previously built.
  * @type {!Object}
  */
-var builtTargets = {}
+let builtTargets = {}
 
 /**
  * @param {!Array.<string>} targets The targets to build.
  * @throws {Error} If not running in dev mode.
  * @constructor
  */
-var Build = function (targets) {
+const Build = function (targets) {
   checkIsDevMode()
   this.targets_ = targets
 }
@@ -70,7 +69,7 @@ Build.prototype.onlyOnce = function () {
  * @throws {Error} If no targets were specified.
  */
 Build.prototype.go = function () {
-  var targets = this.targets_
+  let targets = this.targets_
   if (!targets.length) {
     throw Error('No targets specified')
   }
@@ -88,7 +87,7 @@ Build.prototype.go = function () {
 
   console.log('\nBuilding', targets.join(' '), '...')
 
-  var cmd,
+  let cmd,
     args = targets
   if (process.platform === 'win32') {
     cmd = 'cmd.exe'
@@ -110,7 +109,7 @@ Build.prototype.go = function () {
         return resolve()
       }
 
-      var msg = 'Unable to build artifacts'
+      let msg = 'Unable to build artifacts'
       if (code) {
         // May be null.
         msg += '; code=' + code
@@ -135,7 +134,7 @@ exports.isDevMode = isDevMode
  * @throws {Error} If not running in dev mode.
  */
 exports.of = function (var_args) { // eslint-disable-line
-  var targets = Array.prototype.slice.call(arguments, 0)
+  let targets = Array.prototype.slice.call(arguments, 0)
   return new Build(targets)
 }
 
diff --git a/javascript/node/selenium-webdriver/lib/test/httpserver.js b/javascript/node/selenium-webdriver/lib/test/httpserver.js
index a5a7bbe3e0138..46923c06bed62 100644
--- a/javascript/node/selenium-webdriver/lib/test/httpserver.js
+++ b/javascript/node/selenium-webdriver/lib/test/httpserver.js
@@ -17,11 +17,11 @@
 
 'use strict'
 
-var assert = require('assert'),
+const assert = require('assert'),
   http = require('http'),
   url = require('url')
 
-var net = require('../../net'),
+const net = require('../../net'),
   portprober = require('../../net/portprober'),
   promise = require('../..').promise
 
@@ -32,8 +32,8 @@ var net = require('../../net'),
  *     The request handler for the server.
  * @constructor
  */
-var Server = function (requestHandler) {
-  var server = http.createServer(function (req, res) {
+let Server = function (requestHandler) {
+  let server = http.createServer(function (req, res) {
     requestHandler(req, res)
   })
 
@@ -42,7 +42,7 @@ var Server = function (requestHandler) {
   })
 
   /** @typedef {{port: number, address: string, family: string}} */
-  var Host // eslint-disable-line
+  let Host // eslint-disable-line
 
   /**
    * Starts the server on the given port. If no port, or 0, is provided,
@@ -56,7 +56,7 @@ var Server = function (requestHandler) {
       typeof opt_port !== 'function',
       'start invoked with function, not port (mocha callback)?'
     )
-    var port = opt_port || portprober.findFreePort('localhost')
+    const port = opt_port || portprober.findFreePort('localhost')
     return Promise.resolve(port)
       .then((port) => {
         return promise.checkedNodeCall(
@@ -82,7 +82,7 @@ var Server = function (requestHandler) {
    * @throws {Error} If the server is not running.
    */
   this.address = function () {
-    var addr = server.address()
+    const addr = server.address()
     if (!addr) {
       throw Error('There server is not running!')
     }
@@ -104,8 +104,8 @@ var Server = function (requestHandler) {
    * @throws {Error} If the server is not running.
    */
   this.url = function (opt_pathname) {
-    var addr = this.address()
-    var pathname = opt_pathname || ''
+    const addr = this.address()
+    const pathname = opt_pathname || ''
     return url.format({
       protocol: 'http',
       hostname: net.getLoopbackAddress(),
diff --git a/javascript/node/selenium-webdriver/lib/test/resources.js b/javascript/node/selenium-webdriver/lib/test/resources.js
index 4d7f32ab043c2..553aee00261af 100644
--- a/javascript/node/selenium-webdriver/lib/test/resources.js
+++ b/javascript/node/selenium-webdriver/lib/test/resources.js
@@ -30,7 +30,7 @@ const { projectRoot } = require('./build')
  * @throws {Error} If the file does not exist.
  */
 exports.locate = function (filePath) {
-  var fullPath = path.normalize(path.join(projectRoot(), filePath))
+  const fullPath = path.normalize(path.join(projectRoot(), filePath))
   if (!fs.existsSync(fullPath)) {
     throw Error('File does not exist: ' + filePath)
   }