> 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/voice/release_notes/2.9.0_release_notes.md).

# 2.9.0

This Version includes new improvements in the voice engine, especially in noisy environments. The verification algorithm has been updated to offer greater accuracy, and a new algorithm has been implemented for SNR estimation.

### Added

* The Docker image version is updated to Ubuntu 24.04.
* The number of threads in the service configuration is 1 by default.
* A new verification algorithm with greater accuracy is added.
* Accuracy of the verification and liveness detection algorithms is improved in noisy scenarios. The verification score may differ slightly from the previous version, but voice templates remain compatible.
* The recommended threshold for the speech relative length quality check, in verification and liveness detection use cases, is now 0 (any relative speech length is allowed).
* The SNR estimation algorithm is updated. The estimated values may differ from those in the previous product version, but the overall accuracy of the algorithm remains the same.