Python Wheel Versions

I found a curious and frustrating issue with an outdated version of a dependency being installed in my venv.

Issue

The package rapidyaml is required for 4C. During install of dependencies for the development environment, rapidyaml-0.1.0.post60-cp314-cp314-linux_x86_64.whl was installed instead of the newer rapidyaml-0.10.0*. When attempting to install the package manually on my system, the latest version was indeed used instead of the outdated version.

Diagnosis

I am not as familiar with Python dependency management as I would like to be. The command pip install foo -vv (or -vvv) prompts pip to be more verbose. The verbose output indicated that pip was searching https://pypi.org/simple/rapidyaml for compatible packages.

The pypi simple repository API lists only the download links for a specific Python package. For instance, the package foo has its download links listed at https://pypi.org/simple/foo.

Although this package had enabled wheels for Python 3.14, these wheels were not yet listed on rapidyaml’s simple repository API page. Oddly enough, there was a wheel with support for Python 3.14, but only for v0.1.0 of rapidyaml and no other version.

Fix

The only fixes I’ve identified are

• Ask the package maintainer to fix the listed wheels

• Use a supported version of Python

• Manually install the package from source

Issue was reported to the maintainer in this issue, and I installed an earlier version of Python for this project.

Metadata

Started: 10 Mar 2026

Last edited: 11 Mar 2026