You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
pantheon-toolsets was reported malicious
OSV:MAL-2026-5277 - Malicious code in pantheon-toolsets (PyPI)

pantheon-toolsets
0.5.4

This version was deleted from PyPI around 2026-06-06. Installing fails with:
$ pip3 install pantheon-toolsets==0.5.4 ERROR: Could not find a version that satisfies the requirement pantheon-toolsets==0.5.4
View other deleted versions of pantheon-toolsets

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2026-06-05/ \ pantheon-toolsets==0.5.4
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
pantheon_toolsets-0.5.4-py3-none-any.whl (578.9KB)