# Hugging Face Transformers v4.55.0 — Release & Upgrade Intelligence
- **Product:** Hugging Face Transformers (https://huggingface.co)
- **Version:** v4.55.0
- **Released:** Aug 05, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/transformers/updates/v4.55.0/

## Executive Summary (TL;DR)
Hugging Face Transformers v4.55.0. Source highlight: Welcome GPT OSS, the new open-source model family from OpenAI!

## New Features
- Add MM Grounding DINO  by @rziga in #37925
- Add Fast Segformer Processor (#37024)
- Add MM Grounding DINO (#37925)

## Bug Fixes
- More robust tied weight test  by @Cyrilvallez in #39681
- fix missing model._tp_size from ep refactor  by @winglian in #39688
- Fix missing initialization of `FastSpeech2Conformer`  by @bvantuan in #39689
- fix(tokenization): check token.content for trie  by @pjo256 in #39587
- xpu optimization for generation case  by @sywangyi in #39573
- [processors] add tests for helper fn  by @zucchini-nlp in #39629

## Upgrade Command
```bash
python -m pip install 'transformers==4.55.0'
```