I have a script that is throwing a CERTIFICATE_VERIFY_FAILED on one of the PCs available to me, but not the other. The certificate was updated last week. How do I check if there is a cached version of the certificate somewhere, and get it refreshed? 
I tried manually updating the .pem file in the lib/site-packages/certifi folder but that doesn't seem to make a difference.
Try running command pip install certifi
Python: CERTIFICATE_VERIFY_FAILED, Windows