Open sourceOpen-source releaseMLOps, Tooling & Infrastructure · Reinforcement Learning · Safety & Alignment1 source · Jun 15, 2026

huggingface/transformers v5.12.1: Patch release v5.12.1

Updated the lower bound for PEFT and a fix for auto tokenizer to properly resolve the mistral tokenizer (when mistral-common is installed).

Key points

  • This is similar to v.5.10.3 minus the fixes that were already included in the main release - vLLM will first target 5.10.3 :hugs:
  • Fix peft lower bound #46605 by @hmellor (#46605)
  • mistral common backend fix #46667 by @itazap (#46667)

Sources (1)

  • [1]huggingface/transformers v5.12.1: Patch release v5.12.1
    GitHub: huggingface/transformers · Jun 15, 05:29 PM
    Updated the lower bound for PEFT and a fix for auto tokenizer to properly resolve the mistral tokenizer (when `mistral-common` is installed).
    This is similar to v.5.10.3 minus the fixes that were already included in the main release - vLLM will first target 5.10.3 :hugs:

Extractive summary: sentences quoted from the sources.

Before this

  1. Jun 15, 2026huggingface/transformers v5.10.3: Patch release v5.10.4
  2. Jun 10, 2026huggingface/transformers v5.11.0: Release v5.11.0
  3. Jun 9, 2026Introducing Gemma 4 12B: a unified, encoder-free multimodal model
  4. May 5, 2026huggingface/transformers v5.8.0: Release 5.8.0
  5. Apr 27, 2026vllm-project/vllm v0.20.0
  6. Apr 3, 2026vllm-project/vllm v0.19.0

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