Attempting to renew cert failing

My domain is: https://slurpnet.com

I ran this command: $ sudo certbot renew --dry-run

It produced this output:

Saving debug log to /var/log/letsencrypt/letsencrypt.log
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Processing /etc/letsencrypt/renewal/slurpnet.com.conf
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Cert not due for renewal, but simulating renewal for dry run
Plugins selected: Authenticator webroot, Installer apache
Renewing an existing certificate
Attempting to renew cert (slurpnet.com) from /etc/letsencrypt/renewal/slurpnet.com.conf produced an unexpected e
rror: urn:ietf:params:acme:error:malformed :: The request message was malformed :: Method not allowed. Skipping.
All renewal attempts failed. The following certs could not be renewed:
  /etc/letsencrypt/live/slurpnet.com/fullchain.pem (failure)
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
** DRY RUN: simulating 'certbot renew' close to cert expiry
**          (The test certificates below have not been saved.)
All renewal attempts failed. The following certs could not be renewed:
  /etc/letsencrypt/live/slurpnet.com/fullchain.pem (failure)
** DRY RUN: simulating 'certbot renew' close to cert expiry
**          (The test certificates above have not been saved.)
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1 renew failure(s), 0 parse failure(s)

My web server is: Apache/2.4.25 (Debian)

The operating system my web server runs on is: Debian GNU/Linux 9.12 (stretch)

My hosting provider, if applicable, is: Google Cloud (Virtual Machine)

I can login to a root shell on my machine: Yes

I’m using a control panel to manage my site: No

The version of my client is: certbot 0.28.0

Hi @redhazelgreen

that says:

Your Certbot is too old. An update is required.

Thank you.

I ran
sudo apt-get update
and
sudo apt-get install --only-upgrade certbot

Version is still certbot 0.28.0

Running sudo apt install python-certbot-apache gives me python-certbot-apache is already the newest version (0.28.0-1~deb9u1).

So either I’m doing something wrong with the updating procedure, or that is the latest version available for my system.