diff --git a/hardware/Arduino/35-arduino.html b/hardware/Arduino/35-arduino.html
index 0eb77bd9..459cc2c8 100644
--- a/hardware/Arduino/35-arduino.html
+++ b/hardware/Arduino/35-arduino.html
@@ -42,7 +42,6 @@
     <p>The Arduino must be loaded with the Standard Firmata sketch available in the Arduino examples.</p>
     <p>You can select either Digital or Analogue input. Outputs the value read as <code>msg.payload</code> and the pin number as <code>msg.topic</code>.</p>
     <p>It only outputs on a change of value - fine for digital inputs, but you can get a lot of data from analogue pins which you must then handle.</p>
-    <p>You can set the sample rate from 20 to 65535 mS.</p>
 </script>
 
 <script type="text/javascript">
diff --git a/io/serialport/25-serial.js b/io/serialport/25-serial.js
index 7f2402f4..b68b1a61 100644
--- a/io/serialport/25-serial.js
+++ b/io/serialport/25-serial.js
@@ -218,13 +218,14 @@ module.exports = function(RED) {
                         //newline = newline.replace("\\n","\n").replace("\\r","\r");
                         var olderr = "";
                         var setupSerial = function() {
-                            obj.serial = new serialp.SerialPort(port,{
+                            obj.serial = new serialp(port,{
                                 baudrate: baud,
                                 databits: databits,
                                 parity: parity,
                                 stopbits: stopbits,
-                                parser: serialp.parsers.raw
-                            },true, function(err, results) {
+                                parser: serialp.parsers.raw,
+                                autoOpen: true
+                            }, function(err, results) {
                                 if (err) {
                                     if (err.toString() !== olderr) {
                                         olderr = err.toString();
diff --git a/io/serialport/package.json b/io/serialport/package.json
index 3570537f..16e61b37 100644
--- a/io/serialport/package.json
+++ b/io/serialport/package.json
@@ -1,9 +1,9 @@
 {
     "name"          : "node-red-node-serialport",
-    "version"       : "0.3.0",
+    "version"       : "0.4.0",
     "description"   : "Node-RED nodes to talk to serial ports",
     "dependencies"  : {
-        "serialport"   : "~3.1.2"
+        "serialport"   : "~4.0.3"
     },
     "repository" : {
         "type":"git",