Streamlit Cloud Using Python 3.13 Despite runtime.txt Specifying 3.11

Using Streamlit
1

Hi everyone,

My app requires Python 3.11 due to a dependency (docling). I’ve placed a runtime.txt file in the root of my GitHub repo with the content python-3.11.

  • Repo: https://github.com/impensjonathan/ai-quiz-tutor-upload
  • Deployed App: https://ai-quiz-tutor-upload.streamlit.app/

However, the Streamlit Community Cloud deployment logs consistently show it’s building and running with Python 3.13.3 (e.g., “Using Python 3.13.3 environment…”), which causes my app to fail with torch and asyncio runtime errors.

I’ve confirmed runtime.txt is correct in the main branch and have tried pushing new commits to trigger rebuilds.

Any advice on how to ensure Streamlit Cloud respects the python-3.11 in runtime.txt? Is there something I might be missing?

Thanks!

2

When deploying in Streamlit Cloud, go to Advaced settings to change the Python version:

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Is that documented somewhere?

3

great - thank you