diff --git a/libraries/MCP23S17/.github/workflows/arduino-lint.yml b/libraries/MCP23S17/.github/workflows/arduino-lint.yml
index 8a26f14a..870a1769 100644
--- a/libraries/MCP23S17/.github/workflows/arduino-lint.yml
+++ b/libraries/MCP23S17/.github/workflows/arduino-lint.yml
@@ -6,7 +6,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: arduino/arduino-lint-action@v1
         with:
           library-manager: update
diff --git a/libraries/MCP23S17/.github/workflows/arduino_test_runner.yml b/libraries/MCP23S17/.github/workflows/arduino_test_runner.yml
index fadfa904..5506eb6a 100644
--- a/libraries/MCP23S17/.github/workflows/arduino_test_runner.yml
+++ b/libraries/MCP23S17/.github/workflows/arduino_test_runner.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: 2.6
diff --git a/libraries/MCP23S17/.github/workflows/jsoncheck.yml b/libraries/MCP23S17/.github/workflows/jsoncheck.yml
index 37a11298..beb88295 100644
--- a/libraries/MCP23S17/.github/workflows/jsoncheck.yml
+++ b/libraries/MCP23S17/.github/workflows/jsoncheck.yml
@@ -10,7 +10,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: json-syntax-check
         uses: limitusus/json-syntax-check@v1
         with:
diff --git a/libraries/MCP23S17/CHANGELOG.md b/libraries/MCP23S17/CHANGELOG.md
index 98360f38..a01dd147 100644
--- a/libraries/MCP23S17/CHANGELOG.md
+++ b/libraries/MCP23S17/CHANGELOG.md
@@ -6,6 +6,12 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 
+## [0.5.1] - 2024-03-02
+- Fix #38, add parameter to **begin(bool pullup)**
+- update GitHub/actions to version v4 in workflows.
+- Fix #37, using ints as parameter in constructor.
+
+
 ## [0.5.0] - 2024-01-20
 - Fix #32, improve handling SPI dependency.
 - update examples
diff --git a/libraries/MCP23S17/MCP23S17.cpp b/libraries/MCP23S17/MCP23S17.cpp
index e8b5f9c2..abc2c741 100644
--- a/libraries/MCP23S17/MCP23S17.cpp
+++ b/libraries/MCP23S17/MCP23S17.cpp
@@ -1,7 +1,7 @@
 //
 //    FILE: MCP23S17.cpp
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.5.0
+// VERSION: 0.5.1
 // PURPOSE: Arduino library for SPI MCP23S17 16 channel port expander
 //    DATE: 2021-12-30
 //     URL: https://github.com/RobTillaart/MCP23S17
@@ -24,13 +24,13 @@ MCP23S17::MCP23S17(uint8_t select, uint8_t dataIn, uint8_t dataOut, uint8_t cloc
 
 
 //  HARDWARE SPI
-MCP23S17::MCP23S17(uint8_t select, __SPI_CLASS__ * spi)
+MCP23S17::MCP23S17(int select, __SPI_CLASS__ * spi)
 {
   MCP23S17(select, 0x00, spi);
 }
 
 
-MCP23S17::MCP23S17(uint8_t select, uint8_t address, __SPI_CLASS__ * spi)
+MCP23S17::MCP23S17(int select, int address, __SPI_CLASS__ * spi)
 {
   _address = (address << 1);
   _select  = select;
@@ -40,7 +40,7 @@ MCP23S17::MCP23S17(uint8_t select, uint8_t address, __SPI_CLASS__ * spi)
 }
 
 
-bool MCP23S17::begin()
+bool MCP23S17::begin(bool pullup)
 {
   ::pinMode(_select, OUTPUT);
   ::digitalWrite(_select, HIGH);
@@ -71,9 +71,12 @@ bool MCP23S17::begin()
   //    0 = Sequential operation enabled, address pointer increments.
   if (! writeReg(MCP23S17_IOCR, MCP23S17_IOCR_SEQOP)) return false;
 
-  //  Force INPUT_PULLUP
-  if (! writeReg(MCP23S17_PUR_A, 0xFF)) return false;   //  0xFF == all UP
-  if (! writeReg(MCP23S17_PUR_B, 0xFF)) return false;   //  0xFF == all UP
+  if (pullup)
+  {
+    //  Force INPUT_PULLUP
+    if (! writeReg(MCP23S17_PUR_A, 0xFF)) return false;   //  0xFF == all UP
+    if (! writeReg(MCP23S17_PUR_B, 0xFF)) return false;   //  0xFF == all UP
+  }
   return true;
 }
 
diff --git a/libraries/MCP23S17/MCP23S17.h b/libraries/MCP23S17/MCP23S17.h
index d69906da..fff8c15a 100644
--- a/libraries/MCP23S17/MCP23S17.h
+++ b/libraries/MCP23S17/MCP23S17.h
@@ -2,7 +2,7 @@
 //
 //    FILE: MCP23S17.h
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.5.0
+// VERSION: 0.5.1
 // PURPOSE: Arduino library for SPI MCP23S17 16 channel port expander
 //    DATE: 2021-12-30
 //     URL: https://github.com/RobTillaart/MCP23S17
@@ -13,7 +13,7 @@
 #include "MCP23S17_registers.h"
 
 
-#define MCP23S17_LIB_VERSION              (F("0.5.0"))
+#define MCP23S17_LIB_VERSION              (F("0.5.1"))
 
 //  ERROR CODES
 #define MCP23S17_OK                       0x00
@@ -43,10 +43,10 @@ public:
   //  SOFTWARE SPI
   MCP23S17(uint8_t select, uint8_t dataIn, uint8_t dataOut, uint8_t clock, uint8_t address = 0x00);
   //  HARDWARE SPI
-  MCP23S17(uint8_t select, __SPI_CLASS__ * spi);
-  MCP23S17(uint8_t select, uint8_t address = 0x00, __SPI_CLASS__ * spi = &SPI);
+  MCP23S17(int select, __SPI_CLASS__ * spi);
+  MCP23S17(int select, int address = 0x00, __SPI_CLASS__ * spi = &SPI);
 
-  bool     begin();
+  bool     begin(bool pullup = true);
   bool     isConnected();
   uint8_t  getAddress();   //  default returns 0x00
 
diff --git a/libraries/MCP23S17/README.md b/libraries/MCP23S17/README.md
index b4bd417f..42732736 100644
--- a/libraries/MCP23S17/README.md
+++ b/libraries/MCP23S17/README.md
@@ -84,11 +84,13 @@ Also it makes the library a bit simpler to maintain.
 ### Constructor
 
 - **MCP23S17(uint8_t select, uint8_t dataIn, uint8_t dataOut, uint8_t clock, uint8_t address = 0x00)** constructor SOFTWARE SPI.
-- **MCP23S17(uint8_t select, SPIClassRP2040\* spi)** constructor HARDWARE SPI with explicit SPI interface selected.
-- **MCP23S17(uint8_t select, SPIClass\* spi)** constructor HARDWARE SPI with explicit SPI interface selected.
-- **MCP23S17(uint8_t select, uint8_t address = 0x00, SPIClassRP2040\* spi = &SPI)** constructor HARDWARE SPI with optional address pins and SPI interface.
-- **MCP23S17(uint8_t select, uint8_t address = 0x00, SPIClass\* spi = &SPI)** constructor HARDWARE SPI with optional address pins and SPI interface.
-- **bool begin()** returns true if successful.
+- **MCP23S17(int select, SPIClassRP2040\* spi)** constructor HARDWARE SPI with explicit SPI interface selected.
+- **MCP23S17(int select, SPIClass\* spi)** constructor HARDWARE SPI with explicit SPI interface selected.
+- **MCP23S17(int select, int address = 0x00, SPIClassRP2040\* spi = &SPI)** constructor HARDWARE SPI with optional address pins and SPI interface.
+- **MCP23S17(int select, int address = 0x00, SPIClass\* spi = &SPI)** constructor HARDWARE SPI with optional address pins and SPI interface.
+- **bool begin(bool pullup = true)** initializes library, returns true if successful. 
+Default sets the pins to INPUT PULLUP.
+Returns false if not connected or a register could not be set.
 - **bool isConnected()** returns true if connected, false otherwise. (dummy for compatibility reasons)
 - **uint8_t getAddress()** returns the address set in the constructor. 
 Default = 0, range = 0..7.
diff --git a/libraries/MCP23S17/examples/MCP23S17_test_led_bar/MCP23S17_test_led_bar.ino b/libraries/MCP23S17/examples/MCP23S17_test_led_bar/MCP23S17_test_led_bar.ino
index 31a02aeb..37eccdbd 100644
--- a/libraries/MCP23S17/examples/MCP23S17_test_led_bar/MCP23S17_test_led_bar.ino
+++ b/libraries/MCP23S17/examples/MCP23S17_test_led_bar/MCP23S17_test_led_bar.ino
@@ -17,6 +17,7 @@ MCP23S17 MCP(10);           //  HW SPI address 0x00
 
 uint32_t start, stop;
 
+
 void setup()
 {
   Serial.begin(115200);
diff --git a/libraries/MCP23S17/examples/MCP23S17_two_ADDRESS/MCP23S17_two_ADDRESS.ino b/libraries/MCP23S17/examples/MCP23S17_two_ADDRESS/MCP23S17_two_ADDRESS.ino
index 458cb3ac..b1988041 100644
--- a/libraries/MCP23S17/examples/MCP23S17_two_ADDRESS/MCP23S17_two_ADDRESS.ino
+++ b/libraries/MCP23S17/examples/MCP23S17_two_ADDRESS/MCP23S17_two_ADDRESS.ino
@@ -10,11 +10,11 @@
 #include "MCP23S17.h"
 
 
-MCP23S17 MCP_A(10, 12, 11, 13, 0);   //  SW SPI, address 0
-MCP23S17 MCP_B(10 , 12, 11, 13, 1);  //  SW SPI, address 1
+//MCP23S17 MCP_A(10, 12, 11, 13, 0);   //  SW SPI, address 0
+//MCP23S17 MCP_B(10, 12, 11, 13, 1);   //  SW SPI, address 1
 
-//  MCP23S17 MCP_A(10, 0);   //  HW SPI, address 0
-//  MCP23S17 MCP_B(10, 1);   //  HW SPI, address 1
+MCP23S17 MCP_A(10, &SPI);   //  HW SPI, address 0 (default)
+MCP23S17 MCP_B(10, 1);      //  HW SPI, address 1
 
 
 void setup()
@@ -52,6 +52,7 @@ void setup()
 void loop()
 {
   int x = random(32);
+  Serial.println(x);
   if (x < 16)
   {
     MCP_A.write1(x, HIGH);
diff --git a/libraries/MCP23S17/library.json b/libraries/MCP23S17/library.json
index 47cb9a6a..510cff3c 100644
--- a/libraries/MCP23S17/library.json
+++ b/libraries/MCP23S17/library.json
@@ -15,7 +15,7 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/MCP23S17.git"
   },
-  "version": "0.5.0",
+  "version": "0.5.1",
   "license": "MIT",
   "frameworks": "*",
   "platforms": "*",
diff --git a/libraries/MCP23S17/library.properties b/libraries/MCP23S17/library.properties
index 37eb47f6..2d445dfa 100644
--- a/libraries/MCP23S17/library.properties
+++ b/libraries/MCP23S17/library.properties
@@ -1,5 +1,5 @@
 name=MCP23S17
-version=0.5.0
+version=0.5.1
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Arduino library for SPI MCP23S17 16 channel port expander 16 IO-lines