Can't force renew certificate

I was able to force renew my certificate in June. Now when I issue command:

/usr/bin/dehydrated -c --force -d foo.com

I get the error:

ERROR: Problem connecting to server (get for https://acme-v02.api.letsencrypt.org/directory; curl returned with 60)

Is it because the root certificate DST Root CA X3 expired and now I can't connect to the acme website?

What do I have to do to renew my certificate. I have slackware and updated curl but that did not help.

What kind of operating system the dehydrated software is running and what is the version of the OS?

The OS is Slackware 14.1.
It is based on linux.

Try updating your ca-certificates package. The ca-certificates-20211005-noarch-1_slack14 package contains the ISRG Root X1 certificate, which seems to be missing from your system.

Thank you for your help.
I am having difficulty installing the packge. When I try

slackpkg install ca-certificates-20211005-noarch-1_slack14

I get the message:

"The package list is missing.
Before you install|upgrade|reinstall anything you need to run:

    # slackpkg update"

I've done that.

What's the current version of ca-certificates on your system? ca-certificates-20130906-noarch-1 by any chance?

Because when I search for ca-certificates for Slackware 14.1, I get two results: The Slackware Linux Project: Packages An ancient version and a recent version. But the "location" of the recent version is "patches/packages", whatever that may be. Maybe you need to enable "patches" first? (I don't have the slightest clue about Slackware... Didn't even know it still existed..)

How about just?