1/1 End-of-Life Advisory Title End-of-Life Advisory for ESP-IDF v4.0 Release Branch Issue date 2022/01/06 Advisory Number AR2021-007 Serial Number NA Version V1.0 This advisory serves as a formal notification of the End-of-Life (EOL) for ESP-IDF v4.0 release branch in accordance with Espressif’s IDF support policy. ESP-IDF v4.0 release branch reached EOL in October 2021, announced on Espressif’s IDF support policy page on GitHub accessible via the link here. With EOL, new features, bug fixes, and security fixes will no longer be supported on this branch. Customers who are currently using ESP-IDF v4.0 release branches are encouraged to upgrade their projects to more recent ESP-IDF releases. At the time of writing, the latest stable ESP-IDF version is v4.3.2. To find out more about support periods, see ESP-IDF Versions. If you have questions regarding Espressif’s IDF support policy and options to upgrade from EOL ESP-IDF release branches, please contact Espressif.