# Hugging Face Transformers v4.2.1 — Release & Upgrade Intelligence
- **Product:** Hugging Face Transformers (https://huggingface.co)
- **Version:** v4.2.1
- **Released:** Jan 14, 2021
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/transformers/updates/v4.2.1/

## Executive Summary (TL;DR)
Hugging Face Transformers v4.2.1. Source highlight: This patch contains three fixes:

## Bug Fixes
- Fix Trainer with a parallel model #9578 (@sgugger)

## Upgrade Command
```bash
python -m pip install 'transformers==4.2.1'
```