# Hugging Face Transformers v4.12.4 — Release & Upgrade Intelligence
- **Product:** Hugging Face Transformers (https://huggingface.co)
- **Version:** v4.12.4
- **Released:** Nov 16, 2021
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/transformers/updates/v4.12.4/

## Executive Summary (TL;DR)
Hugging Face Transformers v4.12.4. Source highlight: Fix gradient_checkpointing backward compatibility (#14408)

## Improvements
- enhance rewrite state_dict missing _metadata (#14348)
- improve rewrite state_dict missing _metadata (#14276)

## Bug Fixes
- Fix gradient_checkpointing backward compatibility (#14408)
- Fix of issue #13327: Wrong weight initialization for TF t5 model (#14241)

## Upgrade Command
```bash
python -m pip install 'transformers==4.12.4'
```