Why Does `pip install` Fail on macOS Sierra and Older, and How Can I Fix the 'Could Not Find a Version' Error?

pip Install Fails for Every Package: Resolving "Could Not Find a Version" with TLS Upgrade

Encountering the error "Could not find a version that satisfies the requirement" while attempting to install any package through pip can be frustrating. This issue arises specifically for users running Mac OS X version 10.12 (Sierra) or older.

Solution: Upgrade Pip Manually

To resolve this, it is crucial to upgrade pip manually using the following command:

curl https://bootstrap.pypa.io/get-pip.py | python

Importance of TLS Upgrade

This upgrade is necessary because Python.org sites have stopped supporting TLS versions 1.0 and 1.1. As a result, older macOS versions cannot use pip unless they update it to the latest version (9.0.3).

Installing via pip install --upgrade pip is not a viable solution, as it falls into a "chicken-and-egg" situation.

Additional Considerations

• After upgrading pip, it is essential to also upgrade setuptools by running:

  pip install --upgrade setuptools

• Reference the Python status page for updates on the TLS upgrade rollout: https://status.python.org/
• For further details on this issue, refer to this thread: https://github.com/pypa/pip/issues/5820
• Twitter announcement regarding the pip upgrade: https://twitter.com/pypa/status/982236066498654208

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