diff --git a/README.md b/README.md
index 866e891..2f5e15b 100644
--- a/README.md
+++ b/README.md
@@ -341,7 +341,10 @@ The **tone library (using timer 2) is still available**. You can use it alternat
 <br/>
 
 # Revision History
+### Version 3.6.4
+
 ### Version 3.6.3
+- Fixed ESP32 send timer bug.
 
 ### Version 3.6.2
 - Fixed FEEDBACK_LED_IS_ACTIVE_LOW bug.
diff --git a/library.json b/library.json
index fba392b..ff23fe7 100644
--- a/library.json
+++ b/library.json
@@ -6,7 +6,7 @@
     "type": "git",
     "url": "https://github.com/IRMP-org/IRMP"
   },
-  "version": "3.6.2",
+  "version": "3.6.3",
   "exclude": "pictures",
   "authors":  [
     {
diff --git a/library.properties b/library.properties
index 797a6d9..aac7d18 100644
--- a/library.properties
+++ b/library.properties
@@ -1,9 +1,9 @@
 name=IRMP
-version=3.6.2
+version=3.6.3
 author=Frank Meyer, Armin Joachimsmeyer
 maintainer=Armin Joachimsmeyer <armin.arduino@gmail.com>, frank@fli4l.de
 sentence=Receive and send infrared signals.<br/>
-paragraph=<ul><li>Supports <b>50 different IR and 3 RF protocols</b>.</li><li>Can receive <b>40 protocols concurrently</b>.</li><li><b>Small</b> footprint and <b>robust</b> decoding.</li><li>Receive and send can be used in the <b>same sketch.</b></li><li>Supports ATtiny, AVR and MegaAVR boards as well as ESP8266, ESP32, STM32, SAMD, RP2040 and Apollo boards.</li></ul><br/><br/><b>New: </b>Added ATtiny88 / AVR timer1 timer support. Fixed send timing bug.<br/>
+paragraph=<ul><li>Supports <b>50 different IR and 3 RF protocols</b>.</li><li>Can receive <b>40 protocols concurrently</b>.</li><li><b>Small</b> footprint and <b>robust</b> decoding.</li><li>Receive and send can be used in the <b>same sketch.</b></li><li>Supports ATtiny, AVR and MegaAVR boards as well as ESP8266, ESP32, STM32, SAMD, RP2040 and Apollo boards.</li></ul><br/><br/><b>New: </b>Fixed send timing bug for ESP32.<br/>
 category=Signal Input/Output
 url=https://github.com/IRMP-org/IRMP
 architectures=avr,megaavr,samd,esp8266,esp32,stm32,STM32F1,apollo3,mbed,mbed_nano,rp2040
diff --git a/src/irmpVersion.h b/src/irmpVersion.h
index 0bc3d30..4e8ff72 100644
--- a/src/irmpVersion.h
+++ b/src/irmpVersion.h
@@ -10,10 +10,10 @@
 #ifndef _IRMPVERSION_H
 #define _IRMPVERSION_H
 
-#define VERSION_IRMP "3.6.2"
+#define VERSION_IRMP "3.6.3"
 #define VERSION_IRMP_MAJOR 3
 #define VERSION_IRMP_MINOR 6
-#define VERSION_IRMP_PATCH 2
+#define VERSION_IRMP_PATCH 3
 
 /*
  * Macro to convert 3 version parts into an integer