diff --git a/libraries/FastShiftOut/.github/workflows/arduino-lint.yml b/libraries/FastShiftOut/.github/workflows/arduino-lint.yml
index b2ca058c..8a26f14a 100644
--- a/libraries/FastShiftOut/.github/workflows/arduino-lint.yml
+++ b/libraries/FastShiftOut/.github/workflows/arduino-lint.yml
@@ -6,7 +6,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: arduino/arduino-lint-action@v1
         with:
           library-manager: update
diff --git a/libraries/FastShiftOut/.github/workflows/arduino_test_runner.yml b/libraries/FastShiftOut/.github/workflows/arduino_test_runner.yml
index 096b975b..fadfa904 100644
--- a/libraries/FastShiftOut/.github/workflows/arduino_test_runner.yml
+++ b/libraries/FastShiftOut/.github/workflows/arduino_test_runner.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: 2.6
diff --git a/libraries/FastShiftOut/.github/workflows/jsoncheck.yml b/libraries/FastShiftOut/.github/workflows/jsoncheck.yml
index 04603d08..37a11298 100644
--- a/libraries/FastShiftOut/.github/workflows/jsoncheck.yml
+++ b/libraries/FastShiftOut/.github/workflows/jsoncheck.yml
@@ -10,7 +10,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: json-syntax-check
         uses: limitusus/json-syntax-check@v1
         with:
diff --git a/libraries/FastShiftOut/CHANGELOG.md b/libraries/FastShiftOut/CHANGELOG.md
index ac74973f..fe6973b7 100644
--- a/libraries/FastShiftOut/CHANGELOG.md
+++ b/libraries/FastShiftOut/CHANGELOG.md
@@ -6,16 +6,23 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 
+## [0.3.1] - 2023-02-20
+- update readme.md
+- update GitHub actions
+- update license 2023
+- minor edits
+
+
 ## [0.3.0] - 2022-11-05
 - major refactor
 
+----
 
 ## [0.2.5] - 2022-11-05
 - add changelog.md
 - add rp2040 to build-CI
 - update readme.md
 
-
 ## [0.2.4] - 2021-12-17
 - license
 
diff --git a/libraries/FastShiftOut/Examples/FastShiftOut_demo/performance_0.3.1.txt b/libraries/FastShiftOut/Examples/FastShiftOut_demo/performance_0.3.1.txt
new file mode 100644
index 00000000..0eb25827
--- /dev/null
+++ b/libraries/FastShiftOut/Examples/FastShiftOut_demo/performance_0.3.1.txt
@@ -0,0 +1,30 @@
+IDE:   1.8.19
+Board: UNO
+
+example fastShiftOut: 0.3.1
+
+Performance - time in us
+        write: 23.41
+        write: 45.89
+        Delta: 22.48
+
+writeLSBFIRST: 22.51
+writeLSBFIRST: 45.88
+        Delta: 23.37
+
+writeMSBFIRST: 23.02
+writeMSBFIRST: 44.88
+        Delta: 21.86
+
+Standard shiftOut1: 89.85
+Standard shiftOut2: 179.59
+             Delta: 89.74
+
+
+Test print interface
+println("Hello world"): 	328.92
+println(1357): 			313.56
+println(3.14159265, 4): 	717.36
+
+done ...
+
diff --git a/libraries/FastShiftOut/FastShiftOut.cpp b/libraries/FastShiftOut/FastShiftOut.cpp
index 1d2698aa..3ef80102 100644
--- a/libraries/FastShiftOut/FastShiftOut.cpp
+++ b/libraries/FastShiftOut/FastShiftOut.cpp
@@ -1,12 +1,10 @@
 //
 //    FILE: FastShiftOut.cpp
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.2.5
+// VERSION: 0.3.1
 // PURPOSE: ShiftOut that implements the Print interface
 //    DATE: 2013-08-22
 //     URL: https://github.com/RobTillaart/FastShiftOut
-//
-// HISTORY: see changelog.md
 
 
 #include "FastShiftOut.h"
@@ -33,7 +31,7 @@ FastShiftOut::FastShiftOut(uint8_t dataOut, uint8_t clockPin, uint8_t bitOrder)
 #else   //  reference implementation
 
   _dataPinOut = dataOut;
-  _clockPin = clockPin;
+  _clockPin   = clockPin;
 
 #endif
 }
@@ -41,7 +39,6 @@ FastShiftOut::FastShiftOut(uint8_t dataOut, uint8_t clockPin, uint8_t bitOrder)
 
 size_t FastShiftOut::write(uint8_t data)
 {
-  _value = data;
   if (_bitOrder == LSBFIRST)
   {
     return writeLSBFIRST(data);
@@ -50,11 +47,35 @@ size_t FastShiftOut::write(uint8_t data)
 }
 
 
+/* experimental
+size_t write(const uint8_t \*buffer, size_t size)
+{
+  size_t n = 0;
+  if (_bitOrder == LSBFIRST)
+  {
+    for (size_t i = size; i > 0; )      //  from end to begin ????
+    {
+      i--;
+      n += writeLSBFIRST(buffer[i]);
+    }
+  }
+  else
+  {
+    for (size_t i = 0; i < size; i++)   //  from begin to end..
+    {
+      n += writeMSBFIRST(buffer[i]);
+    }
+  }
+  return n;
+}
+*/
+
+
 size_t FastShiftOut::writeLSBFIRST(uint8_t data)
 {
   uint8_t value = data;
-  _value = value;
-  
+  _lastValue = value;
+
 #if defined(ARDUINO_ARCH_AVR) || defined(ARDUINO_ARCH_MEGAAVR)
 
   uint8_t cbmask1  = _clockBit;
@@ -86,8 +107,8 @@ size_t FastShiftOut::writeLSBFIRST(uint8_t data)
 size_t FastShiftOut::writeMSBFIRST(uint8_t data)
 {
   uint8_t value = data;
-  _value = value;
-  
+  _lastValue = value;
+
 #if defined(ARDUINO_ARCH_AVR) || defined(ARDUINO_ARCH_MEGAAVR)
 
   uint8_t cbmask1  = _clockBit;
@@ -113,14 +134,13 @@ size_t FastShiftOut::writeMSBFIRST(uint8_t data)
 #endif
 
   return 1;
-
 }
 
 
 uint8_t FastShiftOut::lastWritten(void)
 {
-  return _value;
-};
+  return _lastValue;
+}
 
 
 bool FastShiftOut::setBitOrder(const uint8_t bitOrder)
@@ -137,8 +157,8 @@ bool FastShiftOut::setBitOrder(const uint8_t bitOrder)
 uint8_t FastShiftOut::getBitOrder(void)
 {
   return _bitOrder;
-};
+}
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/libraries/FastShiftOut/FastShiftOut.h b/libraries/FastShiftOut/FastShiftOut.h
index 5fbc70e5..226ed683 100644
--- a/libraries/FastShiftOut/FastShiftOut.h
+++ b/libraries/FastShiftOut/FastShiftOut.h
@@ -2,7 +2,7 @@
 //
 //    FILE: FastShiftOut.h
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.3.0
+// VERSION: 0.3.1
 // PURPOSE: shiftOut class that implements the Print interface
 //    DATE: 2013-08-22
 //     URL: https://github.com/RobTillaart/FastShiftOut
@@ -11,7 +11,7 @@
 #include "Arduino.h"
 #include "Print.h"
 
-#define FASTSHIFTOUT_LIB_VERSION        (F("0.3.0"))
+#define FASTSHIFTOUT_LIB_VERSION        (F("0.3.1"))
 
 
 class FastShiftOut : public Print
@@ -21,6 +21,8 @@ public:
   FastShiftOut(uint8_t dataOut, uint8_t clockPin, uint8_t bitOrder = LSBFIRST);
 
   size_t  write(uint8_t data);
+  //  experimental
+  //  size_t write(const uint8_t \*buffer, size_t size);
   uint8_t lastWritten(void);
 
   bool    setBitOrder(uint8_t bitOrder);
@@ -32,7 +34,7 @@ public:
 
 private:
   uint8_t _bitOrder;
-  int     _value;
+  int     _lastValue;
 
 
 #if defined(ARDUINO_ARCH_AVR) || defined(ARDUINO_ARCH_MEGAAVR)
diff --git a/libraries/FastShiftOut/LICENSE b/libraries/FastShiftOut/LICENSE
index c9bd779a..d77cf66c 100644
--- a/libraries/FastShiftOut/LICENSE
+++ b/libraries/FastShiftOut/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2013-2022 Rob Tillaart
+Copyright (c) 2013-2023 Rob Tillaart
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/libraries/FastShiftOut/README.md b/libraries/FastShiftOut/README.md
index d2d21e1f..4dd4c022 100644
--- a/libraries/FastShiftOut/README.md
+++ b/libraries/FastShiftOut/README.md
@@ -35,20 +35,28 @@ The performance of **write()** is substantially faster than the default Arduino
 Exact how big the performance gain is can be seen with the example sketch.
 It does a comparison and shows how the class is to be used.
 
-test 0.2.4  Arduino UNO
+Time in microseconds, Arduino UNO
 
-|  function             | time (us) |
-|:----------------------|----------:|
-|  write()              |    21.66  |
-|  writeLSBFIRST()      |    22.94  |
-|  writeMSBFIRST()      |    20.30  |
-|  reference shiftOut() |    89.74  |
+|  function                |  0.2.4  |   0.3.1  |
+|:-------------------------|--------:|---------:|
+|  write()                 |  21.66  |   22.48  |
+|  writeLSBFIRST()         |  22.94  |   23.37  |
+|  writeMSBFIRST()         |  20.30  |   21.86  |
+|  reference shiftOut()    |  89.74  |   89.74  |
+|  println("Hello world")  |         |  328.92  |
+|  println(1357)           |         |  313.56  |
+|  println(3.14159265, 4)  |         |  717.36  |
 
 
 ## Interface
 
-The interface exists of the following functions:
+```cpp
+#include "FastShiftOut.h"
+```
 
+#### Functions
+
+- **FastShiftOut(uint8_t dataOut, uint8_t clockPin, uint8_t bitOrder = LSBFIRST)** Constructor.
 - **size_t write(const uint8_t data)** send a byte, also the workhorse of the **Print** interface.
 - **uint8_t lastWritten()** returns last byte written.
 - **bool setBitOrder(uint8_t bitOrder)** set LSBFIRST or MSBFIRST. Returns false for other values.
@@ -56,7 +64,9 @@ The interface exists of the following functions:
 - **size_t writeLSBFIRST(const uint8_t data);**  most optimized.
 - **size_t writeMSBFIRST(const uint8_t data);**  most optimized.
 
+
 As a FastShiftOut object implements the Print interface, one can also call
+
 - **FSO.print(any type);** or 
 - **FSO.println(any type);** 
 
@@ -72,15 +82,21 @@ Note: **FSO.print()** returns the number of characters printed, including an opt
 pull up resistors, especially if wires are exceeding 10 cm (4").
 
 
-## Operation
-
-See examples
-
-
 ## Future
 
+
+#### Must
+
+#### Should
+
+- extend unit tests
+
+#### Could
+
 - performance ESP32
 - check optimized ESP32
 - add **size_t write(const uint8_t \*buffer, size_t size)**
 - example schema
 
+#### Wont
+
diff --git a/libraries/FastShiftOut/keywords.txt b/libraries/FastShiftOut/keywords.txt
index adf43830..f77937af 100644
--- a/libraries/FastShiftOut/keywords.txt
+++ b/libraries/FastShiftOut/keywords.txt
@@ -6,9 +6,12 @@ FastShiftOut	KEYWORD1
 
 # Methods and Functions (KEYWORD2)
 write	KEYWORD2
+
 lastWritten	KEYWORD2
+
 setBitOrder	KEYWORD2
 getBitOrder	KEYWORD2
+
 writeLSBFIRST	KEYWORD2
 writeMSBFIRST	KEYWORD2
 
diff --git a/libraries/FastShiftOut/library.json b/libraries/FastShiftOut/library.json
index a397af04..7423a888 100644
--- a/libraries/FastShiftOut/library.json
+++ b/libraries/FastShiftOut/library.json
@@ -15,7 +15,7 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/FastShiftOut.git"
   },
-  "version": "0.3.0",
+  "version": "0.3.1",
   "license": "MIT",
   "frameworks": "arduino",
   "platforms": "*",
diff --git a/libraries/FastShiftOut/library.properties b/libraries/FastShiftOut/library.properties
index 3052aec7..3ccd7bdd 100644
--- a/libraries/FastShiftOut/library.properties
+++ b/libraries/FastShiftOut/library.properties
@@ -1,5 +1,5 @@
 name=FastShiftOut
-version=0.3.0
+version=0.3.1
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Arduino library for (AVR) optimized shiftOut - e.g. 74HC595
diff --git a/libraries/FastShiftOut/test/unit_test_001.cpp b/libraries/FastShiftOut/test/unit_test_001.cpp
index dd14c5b0..09214ed0 100644
--- a/libraries/FastShiftOut/test/unit_test_001.cpp
+++ b/libraries/FastShiftOut/test/unit_test_001.cpp
@@ -3,7 +3,7 @@
 //  AUTHOR: Rob Tillaart
 //    DATE: 2020-12-03
 // PURPOSE: unit tests for the FastShiftIn library
-//          https://github.com/RobTillaart/FastShiftIn
+//          https://github.com/RobTillaart/FastShiftOut
 //          https://github.com/Arduino-CI/arduino_ci/blob/master/REFERENCE.md
 //
 
@@ -94,4 +94,6 @@ unittest(test_print)
 
 unittest_main()
 
-// --------
+
+//  -- END OF FILE --
+