Trying to update old WordPress gets cURL error 60: Peer's Certificate issuer is not recognized Print

Problem Description

• You receive the following error when attempting to update WordPress -- cURL error 60: Peer's Certificate issuer is not recognized
• You have an old version of WordPress that hasn't been updated in some time
• If it's hosted with us it would be because you didn't have it showing in 1-click web apps or you had auto update disabled.
• If you just migrated it to us, you're now trying to update it and it's failing to do so

Problem Resolution

The version of WordPress is so old that it never received the update that would include newer certificates. You will need to manually update those certificates to fix this. Here's how:

1. If you're not already familiar with it, learn how to use the Plesk File Manager
2. Once in the file manager, navigate to your web root (either the folder called httpdocs or your domain/subdomain) then go to wp-includes/certificates
3. Rename the file in here called ca-bundle.crt to ca-bundle.crt.backup
4. Use the file manager + button to download a file from a URL and enter this URL: https://curl.se/ca/cacert.pem
5. Rename the file from cacert.pem to ca-bundle.crt

That's it! You will now be able to update WordPress core, plugins, and themes.