Seems like the pyhmy package on PyPI doesn’t get updates.
Apparently no updates since September 2020 pyhmy · PyPI
It lists Daniel Van Der Maden as the maintainer who isn’t working on harmony anymore (?)
He didn’t respond at his GitHub mail but maybe someone of the team still has contact?
If not it would be possible to take over the pyhmy package to continue development PEP 541 -- Package Index Name Retention | Python.org
Either way it would probably be helpful to use GitHub Actions to automate releases in the future Publishing package distribution releases using GitHub Actions CI/CD workflows — Python Packaging User Guide
There was already an issue open for this pip3 install pyhmy returns outdated version · Issue #21 · harmony-one/pyhmy · GitHub
And people still run into problems with this Convert_one_to_hex missing from python pyhmy? - #3 by tabasco_ow