diff --git a/README.md b/README.md
index 1239b42..319549b 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 [![Join the chat at https://gitter.im/OpenBCI/OpenBCI_NodeJS](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/OpenBCI/OpenBCI_NodeJS?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Build Status](https://travis-ci.org/OpenBCI/OpenBCI_NodeJS.svg?branch=master)](https://travis-ci.org/OpenBCI/OpenBCI_NodeJS)
 [![codecov](https://codecov.io/gh/OpenBCI/OpenBCI_NodeJS/branch/master/graph/badge.svg)](https://codecov.io/gh/OpenBCI/OpenBCI_NodeJS)
+[![Dependency Status](https://david-dm.org/OpenBCI/OpenBCI_NodeJS.svg)](https://david-dm.org/OpenBCI/OpenBCI_NodeJS)
+[![npm](https://img.shields.io/npm/dm/openbci.svg?maxAge=2592000)](http://npmjs.com/package/openbci)
 
 # OpenBCI Node.js SDK
 
diff --git a/changelog.md b/changelog.md
index 2e6ccaa..14b2784 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,9 @@
+# 1.2.2
+
+### Enhancements
+
+* Upgrade serialport to 4.x
+
 # 1.2.1
 
 ### Bug Fixes
diff --git a/openBCIBoard.js b/openBCIBoard.js
index 13ced00..84a8f38 100644
--- a/openBCIBoard.js
+++ b/openBCIBoard.js
@@ -3,7 +3,7 @@
 var EventEmitter = require('events').EventEmitter,
     util = require('util'),
     stream = require('stream'),
-    serialPort = require('serialport'),
+    SerialPort = require('serialport'),
     openBCISample = require('./openBCISample'),
     k = openBCISample.k,
     openBCISimulator = require('./openBCISimulator'),
@@ -240,7 +240,7 @@ function OpenBCIFactory() {
             } else {
                 /* istanbul ignore if */
                 if (this.options.verbose) console.log('using real board ' + portName);
-                boardSerial = new serialPort.SerialPort(portName, {
+                boardSerial = new SerialPort(portName, {
                     baudRate: this.options.baudRate
                 },(err) => {
                     if (err) reject(err);
@@ -473,14 +473,14 @@ function OpenBCIFactory() {
     OpenBCIBoard.prototype._writeAndDrain = function(data) {
         return new Promise((resolve,reject) => {
             if(!this.serial) reject('Serial port not open');
-            this.serial.write(data,(error,results) => {
-                if(results) {
+            this.serial.write(data,(error) => {
+                if(error) {
+                    console.log('Error [writeAndDrain]: ' + error);
+                    reject(error);
+                } else {
                     this.serial.drain(function() {
                         resolve();
                     });
-                } else {
-                    console.log('Error [writeAndDrain]: ' + error);
-                    reject(error);
                 }
             })
         });
@@ -504,7 +504,7 @@ function OpenBCIFactory() {
                 if (this.options.verbose) console.log('auto found sim board');
                 resolve(k.OBCISimulatorPortName);
             } else {
-                serialPort.list((err, ports) => {
+                SerialPort.list((err, ports) => {
                     if(err) {
                         if (this.options.verbose) console.log('serial port err');
                         reject(err);
@@ -921,7 +921,7 @@ function OpenBCIFactory() {
      */
     OpenBCIBoard.prototype.listPorts = function() {
         return new Promise((resolve, reject) => {
-            serialPort.list((err, ports) => {
+            SerialPort.list((err, ports) => {
                 if(err) reject(err);
                 else {
                     ports.push( {
diff --git a/package.json b/package.json
index 38acd8d..ba36d1e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "openbci",
-  "version": "1.2.1",
+  "version": "1.2.2",
   "description": "The official Node.js SDK for the OpenBCI Biosensor Board.",
   "main": "openBCIBoard",
   "scripts": {
@@ -19,7 +19,7 @@
     "gaussian": "^1.0.0",
     "mathjs": "^3.3.0",
     "performance-now": "^0.2.0",
-    "serialport": "3.1.2",
+    "serialport": "4.0.1",
     "sntp": "^2.0.0",
     "streamsearch": "^0.1.2"
   },
@@ -31,7 +31,7 @@
     "chai-as-promised": "^5.2.0",
     "codecov": "^1.0.1",
     "istanbul": "^0.4.4",
-    "mocha": "^2.3.4",
+    "mocha": "^3.0.2",
     "sandboxed-module": "^2.0.3",
     "sinon": "^1.17.2",
     "sinon-chai": "^2.8.0"