> For the complete documentation index, see [llms.txt](https://docs.facephi.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.facephi.com/docs.facephi-en/sdks/backend-sdk/backend1n/release_notes/4.0.0_release_notes.md).

# 4.0.0

In this major release, the proprietary facial extraction engine has been replaced by the facial flavor of SelphID-SDK. This notably simplifies the project's source code and provides a more robust, thoroughly tested foundation. The Docker image has also been updated, providing a "from scratch" version that eliminates certain vulnerabilities present in official versions. Finally, detailed documentation has been included in web and Swagger formats.

### Added

* Complete public documentation and Swagger.

### Changed

* Use of SelphID `flavor::facial` as a substitute for the biometric engine.
* Simplified Docker image, free of vulnerabilities.