diff --git a/README.md b/README.md
index a0b8aee..c2713d2 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ Aquacontrol32 is developed and tested on hardware based on a [MH-ET LIVE MiniKit
 
 - The latest [aquacontrol32 release](https://github.com/CelliesProjects/aquacontrol32/releases/latest).
 
-- The [Arduino IDE](https://arduino.cc/) 1.8.8.
+- The [Arduino IDE](https://arduino.cc/) 1.8.9.
 
 - The [ESP32 Arduino Core 1.0.1](https://github.com/espressif/arduino-esp32/releases/tag/1.0.1).
 
diff --git a/compile.sh b/compile.sh
index 50547ed..0566c28 100755
--- a/compile.sh
+++ b/compile.sh
@@ -2,5 +2,5 @@ echo Compiling aquacontrol32 version: $(git describe --tags --always)
 echo We are on branch: $(git branch | grep \* | cut -d ' ' -f2)
 echo
 echo "const char * sketchVersion = \"$(git describe --tags --always)\";" > gitTagVersion.h
-~/arduino-1.8.8/arduino --board espressif:esp32:mhetesp32minikit --verify test.ino --pref custom_DebugLevel=esp32_none --port /dev/ttyUSB0 --pref upload.speed=921600 --pref build.path=temp --preserve-temp-files
+~/arduino-1.8.9/arduino --board espressif:esp32:mhetesp32minikit --verify test.ino --pref custom_DebugLevel=esp32_none --port /dev/ttyUSB0 --pref upload.speed=921600 --pref build.path=temp --preserve-temp-files
 rm gitTagVersion.h
diff --git a/flash.sh b/flash.sh
index 692ab80..f16d067 100755
--- a/flash.sh
+++ b/flash.sh
@@ -2,5 +2,5 @@ echo Compiling and flashing aquacontrol32 version: $(git describe --tags --alway
 echo We are on branch: $(git branch | grep \* | cut -d ' ' -f2)
 echo
 echo "const char * sketchVersion = \"$(git describe --tags --always)\";" > gitTagVersion.h
-~/arduino-1.8.8/arduino --board espressif:esp32:mhetesp32minikit --upload test.ino --pref custom_DebugLevel=esp32_none --port /dev/ttyUSB0 --pref upload.speed=921600 --preserve-temp-files --pref build.path=temp
+~/arduino-1.8.9/arduino --board espressif:esp32:mhetesp32minikit --upload test.ino --pref custom_DebugLevel=esp32_none --port /dev/ttyUSB0 --pref upload.speed=921600 --preserve-temp-files --pref build.path=temp --pref build.flash_freq=80m
 rm gitTagVersion.h