upgrade pip and setuptools used by venv
Once you find that /your/installed/version/bin/python3 -m venv /some/venv followed by /some/venv/bin/pip install some_package gives a message that there is an update for pip, this package can update the wheel files used by ensurepip to the latest versions available on pypi.
You can do this upgrade by running:
/your/installed/version/bin/python3 -m upgrade_ensurepip
A heck against the sha256 is made before saving the newly downloaded wheels to disc. After finding and downloading newer versiosn, the /your/installed/version/lib/pythonX.Y/ensurepip/__init__.py file is updated as it hard-codes the versions of the wheels used. Before changing, a backup of the original is made if such a backup does not yet exists.
Old wheels are preserved, so only backup file __init__.py.org located under /your/installed/version/lib/pythonX.Y/ensurepip/ needs to be copied back in case you encounter problems.
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.