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The previous fix (#481) capped transformers at 4.57.6 in requirements-mlx.txt, but pip's clean resolver in CI can't satisfy that alongside mlx-audio>=0.3.1 (declares `transformers==5.0.0rc3` or `>=5.0.0`) — it backtracks through every transformers and tokenizers version and exits with `ResolutionImpossible`. The dev install worked only because mlx-audio 0.4.1 was already present, so pip never tried to re-resolve. mlx-audio 0.4.1 + mlx-lm 0.31.1 both declare transformers>=5.x but the API surface we actually use works fine on 4.57.x in practice (verified across all engines in dev). Install both --no-deps to bypass the resolver; transitive runtime deps (huggingface_hub, librosa, numpy, numba, pyloudnorm, etc.) are already pulled in by requirements.txt. Co-authored-by: Claude Opus 4.7 (1M context) <[email protected]>