Qwen TTS conflicts with Transformers: inspect the pins before downgrading ComfyUI

Scope and symptoms

Separate the node wrapper's requirements from those of the Qwen TTS distribution. A precise project pin is not a recommended shared version for every model.

Search fragments; wording and context vary:

qwen-tts
transformers==4.57.3

Source-supported context

The Qwen3-TTS pyproject.toml inspected on 2026-09-22 declares transformers==4.57.3 and accelerate==1.12.0. This records that source snapshot, not every historical distribution, third-party wrapper or future release. V04-QWENTTS

Distinguish these cases

1. Qwen TTS requires an exact version outside another image, video or language node's supported range.

2. A wrapper supplies additional compatibility code or dependencies beyond the standalone upstream project.

3. Distribution metadata is satisfied while a model class, optional backend or resource still fails at runtime.

Suggested diagnostic sequence

This sequence is editorial guidance, not a diagnosis of your machine.

1. Using the interpreter that starts ComfyUI, read installed versions and Requires-Dist metadata for qwen-tts, transformers and accelerate. Record the node repository and revision as well.

2. Run dependency checks and collect requirements from every affected consumer. Determine whether their supported ranges intersect rather than privileging the last package installed.

3. Test a shared supported combination in a recoverable copy. If there is no intersection, separate the workloads or select an explicitly supported implementation; ignoring dependencies does not resolve the conflict.

4. Test a minimal permitted speech task with non-private text, then rerun the other retained image or video workflows that use Transformers. Record each outcome separately.

Completion checks

The selected dependency combination is consistent and both the speech task and retained workflows pass. One successful import does not establish environment-wide compatibility.

Limits and cautions

No Qwen TTS inference was run here. The observed pins are dated source evidence, not universal installation instructions; recheck the relevant distribution and source revision when upgrading.

Source review: 2026-09-22. No installation, GPU inference or user-environment repair was executed.

Original sources

• Qwen3-TTS pyproject.toml · 2026-09-22

Related guides

• ModuleNotFoundError in ComfyUI even though the package is installed
• Keep a reproducible ComfyUI repair record without exposing secrets