# Hugging Face Transformers v5.5.2 — Release & Upgrade Intelligence
- **Product:** Hugging Face Transformers (https://huggingface.co)
- **Version:** v5.5.2
- **Released:** Apr 09, 2026
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/transformers/updates/v5.5.2/

## Executive Summary (TL;DR)
Hugging Face Transformers v5.5.2. Source highlight: Small patch dedicated to optimizing gemma4, fixing inference with `use_cache=False` due to k/v states sharing between layers, as well as conversion mappings for some models that would inconsistently serialize their weight names. It contains the following PRs:

## New Features
- Add MoE to Gemma4 TP plan (#45219) by @sywangyi and @Cyrilvallez

## Bug Fixes
- Fix conversion mappings for vlms (#45340)

## Upgrade Command
```bash
python -m pip install 'transformers==5.5.2'
```