diff --git a/lib/twitter.js b/lib/twitter.js
index 9540857e..29477afc 100644
--- a/lib/twitter.js
+++ b/lib/twitter.js
@@ -1,15 +1,15 @@
 //
 //  Twitter API Wrapper
 //
-var assert = require('assert');
-var Promise = require('bluebird');
-var request = require('request');
-var util = require('util');
-var endpoints = require('./endpoints');
-var FileUploader = require('./file_uploader');
-var helpers = require('./helpers');
-var StreamingAPIConnection = require('./streaming-api-connection');
-var STATUS_CODES_TO_ABORT_ON = require('./settings').STATUS_CODES_TO_ABORT_ON;
+const assert = require('assert');
+const Promise = require('bluebird');
+const request = require('request');
+const util = require('util');
+const endpoints = require('./endpoints');
+const FileUploader = require('./file_uploader');
+const helpers = require('./helpers');
+const StreamingAPIConnection = require('./streaming-api-connection');
+const STATUS_CODES_TO_ABORT_ON = require('./settings').STATUS_CODES_TO_ABORT_ON;
 
 // config values required for app-only auth
 var required_for_app_auth = [