# Hugging Face Transformers v4.57.1 — Release & Upgrade Intelligence
- **Product:** Hugging Face Transformers (https://huggingface.co)
- **Version:** v4.57.1
- **Released:** Oct 14, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/transformers/updates/v4.57.1/

## Executive Summary (TL;DR)
Hugging Face Transformers v4.57.1. Source highlight: This patch most notably fixes an issue with an optional dependency (`optax`), which resulted in parsing errors with `poetry`. It contains the following fixes:

## Bug Fixes
- fix optax dep issue
- Fix bnb fsdp loading for pre-quantized checkpoint (#41415)
- Fix tests fsdp (#41422)
- Fix trainer for py3.9 (#41359)

## Upgrade Command
```bash
python -m pip install 'transformers==4.57.1'
```