diff --git a/lib/connection/base.js b/lib/connection/base.js
index 510d695..076ba9b 100644
--- a/lib/connection/base.js
+++ b/lib/connection/base.js
@@ -1,7 +1,7 @@
-var chooseProtocol = require('../protocol').chooseProtocol
+let chooseProtocol = require('../protocol').chooseProtocol
   , EventEmitter = require('events').EventEmitter;
 
-var BaseConnection = module.exports = function(opts) {
+let BaseConnection = module.exports = function(opts) {
   this.opts = Object.assign({
     host : '127.0.0.1',
     scheme: this.getScheme(),
@@ -86,7 +86,7 @@ BaseConnection.prototype.handleClose = function(code, reason) {
 }
 
 BaseConnection.prototype.startReconnection = function() {
-  var connection = this;
+  let connection = this;
   if(!this.reconnectionTimer){
     (this.reconnectionTimer = setInterval(function() { connection.reconnect() }, 500));
   }
@@ -124,9 +124,9 @@ BaseConnection.prototype.reconnect = function() {
 }
 
 BaseConnection.prototype.handleData = function(data) {
-  var message = JSON.parse(data);
+  let message = JSON.parse(data);
 
-  var messageEvent;
+  let messageEvent;
   if (this.protocol === undefined) {
     messageEvent = this.protocol = chooseProtocol(message);
     this.protocolVersionVerified = true;
@@ -156,4 +156,4 @@ BaseConnection.prototype.reportFocus = function(state) {
   }
 }
 
-Object.assign(BaseConnection.prototype, EventEmitter.prototype);
\ No newline at end of file
+Object.assign(BaseConnection.prototype, EventEmitter.prototype);