Have been testing a new feature on a python flask app and having no issues but then encountered a recent build failure and after trying a few fixes figured it would be worth reaching out to the community to see if anyone can provide clarity on how to fix. Build log below:

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Dec 18, 2025, 8:55 PM

[Region: us-west1]

╭─────────────────╮

│ Railpack 0.15.1 │

╰─────────────────╯

↳ Detected Python

↳ Using pip

↳ Found web command in Procfile

Packages

──────────

python │ 3.13.11 │ railpack default (3.13)

Steps

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▸ install

$ python -m venv /app/.venv

$ pip install -r requirements.txt

Deploy

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$ gunicorn app:app

Successfully prepared Railpack plan for build

context: 0fqj-S4T1

load build definition from railpack-plan.json

0ms

install mise packages: python

1s

mise ERROR HTTP status client error (400 Bad Request) for url (https://mise-versions.jdx.dev/python-precompiled-x86_64-unknown-linux-gnu.gz)

mise ERROR Run with --verbose or MISE_VERBOSE=1 for more information

ERROR: failed to build: failed to solve: process "mise install" did not complete successfully: exit code: 1

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Dec 18, 2025, 9:15 PM