diff --git a/README.md b/README.md
index 54866bb..20a43d7 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ This repository contains the OPL2 / OPL3 audio library for the OPL2 Audio Board
 * Emulation with DosBox; you can use the board to output MIDI music (Teensy++ 2.0 and later)
 * Use the board directly as a synthesizer by using the [OPL3BankEditor](https://github.com/Wohlstand/OPL3BankEditor) software by Wohlstand
 
-Current library version is 2.1.0, 23rd January 2021
+Current library version is 2.1.1, 11th July 2021
 
 ### OPL2 Audio Board
 The OPL2 Audio Board is fun and easy board to get started with an OPL2 synthesizer. It is built around the YM3812 OPL2 chip that gives you 9 channels with 2-operators each to produce the classic OPL2 sound that you may remember from early 90s computer games.
diff --git a/build b/build
index d9e0f3b..71161ab 100755
--- a/build
+++ b/build
@@ -20,7 +20,7 @@ echo "\033[1;34m        \\/       \\/           \\/       \\/     \033[0m"
 echo "For the \033[1;36mOPL2 Audio Board\033[0m and \033[1;36mOPL3 Duo!\033[0m synthesizers"
 echo ""
 echo "Installation script for Raspberry Pi and compatibles"
-echo "Library version 2.1.0, 23rd of January 2020"
+echo "Library version 2.1.1, 11th of July 2021"
 echo "Copyright (c) 2016-2021 Maarten Janssen, Cheerful"
 echo ""
 
diff --git a/library.properties b/library.properties
index 873971d..b5f033a 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=Arduino OPL2
-version=2.1.0
+version=2.1.1
 author=Maarten Janssen <maarten@cheerful.nl>
 maintainer=Maarten Janssen <maarten@cheerful.nl>
 sentence=Use this library to control the OPL2 Audio Board or OPL3 Duo!
diff --git a/src/OPL2.cpp b/src/OPL2.cpp
index e8b270d..f9186d9 100644
--- a/src/OPL2.cpp
+++ b/src/OPL2.cpp
@@ -16,7 +16,7 @@
  *            \____|__  /__|  \____ |____/|__|___|  /\____/  \_____\ \  |____|   |__|
  *                    \/           \/             \/                \/
  *
- * YM3812 OPL2 Audio Library for Arduino, Raspberry Pi and Orange Pi v2.1.0
+ * YM3812 OPL2 Audio Library for Arduino, Raspberry Pi and Orange Pi v2.1.1
  * Code by Maarten Janssen (maarten@cheerful.nl) 2016-12-18
  * WWW.CHEERFUL.NL
  *
@@ -36,7 +36,7 @@
  * IMPORTANT: Make sure you set the correct BOARD_TYPE in OPL2.h. Default is set to Arduino.
  *
  *
- * Last updated 2021-01-23
+ * Last updated 2021-07-11
  * Most recent version of the library can be found at my GitHub: https://github.com/DhrBaksteen/ArduinoOPL2
  * Details about the YM3812 and YMF262 chips can be found at http://www.shikadi.net/moddingwiki/OPL_chip
  *