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Open-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).

Hugging FaceHugging Face TransformersvLLMTransformerPEFT
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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.