Update Root Certificate (Let's Encrypt)

After the Let’s Encrypt root certificate expired at the end of September 2021, a few people are still experiencing a certificate expired warning on our websites. We have updated our websites with the current certificate; however, some users may need to update the certificate on their computers. Specifically, we have seen this issue with Mac OS.

Steps to resolve:

  1. Download and open: https://letsencrypt.org/certs/lets-encrypt-r3.pem. The Add Certificates window will pop open.
  2. Under keychain, change the selection to System.
  3. Click Add. If prompted, enter your computer password.
  4. Restart the browser
The SLATE Team