# Hugging Face Transformers v5.8.1 — Release & Upgrade Intelligence
- **Product:** Hugging Face Transformers (https://huggingface.co)
- **Version:** v5.8.1
- **Released:** May 13, 2026
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/transformers/updates/v5.8.1/

## Executive Summary (TL;DR)
Hugging Face Transformers v5.8.1. Source highlight: Patch release v5.8.1

## Bug Fixes
- [fix] Add fatal_error to ContinuousBatchingManager so the serving... by @qgallouedec, @remi-or
- Fix WeightConverter regex incorrectly matching shared_experts as experts by @silencelamb, @claude
- Fix deepseek v4 by @ArthurZucker (#45892)
- Deepseek v4 csa mask collapse by @ArthurZucker, @Sawyer117 (#45928)

## Upgrade Command
```bash
python -m pip install 'transformers==5.8.1'
```