diff --git a/README.md b/README.md
index 8cf904f..03ac54f 100644
--- a/README.md
+++ b/README.md
@@ -248,7 +248,7 @@ PlatformIO is a cross-platform, cross-architecture, multiple framework, professi
 ### Microcontrollers
 
 - [Make: AVR Programming - Elliot Williams](https://www.oreilly.com/library/view/make-avr-programming/9781449356484/)
-- [Mastering STM32 - Carmine Noviello](https://leanpub.com/mastering-stm32)
+- [Mastering STM32 - Carmine Noviello](https://leanpub.com/mastering-stm32-2nd)
 - [Getting Started with STM32 and Nucleo](https://youtube.com/playlist?list=PLEBQazB0HUyRYuzfi4clXsKUSgorErmBv)
 - [Microcontroller Embedded C Programming: Absolute Beginners](https://www.udemy.com/course/microcontroller-embedded-c-programming/)
 - [Embedded Systems STM32 Low-Layer APIs(LL) Driver Development](https://www.udemy.com/course/embedded-systems-stm32-low-level-ll-driver-development/)