diff --git a/avr-gcc-toolchain.cmake b/avr-gcc-toolchain.cmake
index e49f583..6c0a425 100644
--- a/avr-gcc-toolchain.cmake
+++ b/avr-gcc-toolchain.cmake
@@ -16,7 +16,8 @@ set(AVR_MCU attiny13a)
 
 #set(F_CPU 16000000UL)
 #set(F_CPU 8000000)
-set(F_CPU 4800000)
+set(F_CPU 9600000)
+#set(F_CPU 4800000)
 
 add_compile_definitions(F_CPU=${F_CPU})
 # add_compile_definitions(MCU=atmega328p)