diff --git a/drivers/enttec-open-usb-dmx.js b/drivers/enttec-open-usb-dmx.js
index 75a14d3..0883c9e 100644
--- a/drivers/enttec-open-usb-dmx.js
+++ b/drivers/enttec-open-usb-dmx.js
@@ -1,6 +1,6 @@
 "use strict"
 
-var SerialPort = require("serialport").SerialPort
+var SerialPort = require("serialport")
 
 function EnttecOpenUsbDMX(device_id, options) {
 	var self = this
@@ -16,7 +16,7 @@ function EnttecOpenUsbDMX(device_id, options) {
 		'databits': 8,
 		'stopbits': 2,
 		'parity': 'none'
-	}, true, function(err) {
+	}, function(err) {
 		if(err) {
 			console.log(err)
 			return
diff --git a/drivers/enttec-usb-dmx-pro.js b/drivers/enttec-usb-dmx-pro.js
index 7d0837c..8954f7e 100644
--- a/drivers/enttec-usb-dmx-pro.js
+++ b/drivers/enttec-usb-dmx-pro.js
@@ -1,6 +1,6 @@
 "use strict"
 
-var SerialPort = require("serialport").SerialPort
+var SerialPort = require("serialport")
 
 var	  ENTTEC_PRO_DMX_STARTCODE = 0x00
 	, ENTTEC_PRO_START_OF_MSG  = 0x7e
@@ -20,7 +20,7 @@ function EnttecUSBDMXPRO(device_id, options) {
 		'databits': 8,
 		'stopbits': 2,
 		'parity': 'none'
-	}, true, function(err) {
+	}, function(err) {
 		if(!err) {
 			self.send_universe()
 		}
diff --git a/package.json b/package.json
index d5ef51d..bf75fd4 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
 				"light control"
 		],
 		"dependencies": {
-				"serialport": "2.1.x",
+				"serialport": "4.0.x",
 				"socket.io":  "0.9.x",
 				"connect":    "2.11.x",
 				"express":    "3.4.x",