# v18.6.0

## Migration Guide

This document lists recommended and required changes for those migrating from the previous v18.5.0
firmware release to the new v18.6.0 firmware release.

* The upstream (draft) migration guide for the Zephyr v4.2.0 release is available
[here](https://github.com/zephyrproject-rtos/zephyr/blob/main/doc/releases/migration-guide-4.2.rst).

* Users of the `bh_arc/gpio.h` API should switch to the official Zephyr GPIO API.