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[BUG] v57.1.0 on Python v3.6 SSL Errors #2728

Description

@philthompson10

setuptools version

57.1.0

Python version

3.6

OS

macOS, Windows

Additional environment information

The problem doesn't seem to occur on Linux. setuptools v57.0.0 works fine.

Description

Running "python setup.py install" on my project fails to install the project's dependencies from PyPI.

Expected behavior

Normal installation.

How to Reproduce

python setup.py install

Output

Searching for toml
Reading https://pypi.org/simple/toml/
Download error on https://pypi.org/simple/toml/: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:748) -- Some packages may not be found!
Couldn't find index page for 'toml' (maybe misspelled?)
Scanning index of all packages (this may take a while)
Reading https://pypi.org/simple/
Download error on https://pypi.org/simple/: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:748) -- Some packages may not be found!
No local packages or working download links found for toml
error: Could not find suitable distribution for Requirement.parse('toml')

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