Unsupported OS detected: Raspbian 10

The issue I am facing:
pihole -up won't upgrade and I get the message above.
Details about my system:
RPI 3 Model B Plus Rev 1.3
Rasbian v10.13 (buster)
What I have changed since installing Pi-hole:
ran pinhole -up which halted with message to contact Pi-hole Support

Your Operating System is not supported.

Debian 10 (and its derivatives, like Raspian 10) is not supported.

You need to install a newer (and supported) OS.

If you read carefully the whole message, there is a recommendation to try another command: sudo PIHOLE_SKIP_OS_CHECK=true pihole -r

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What's the best way to upgrade the OS, so we don't have to keep working around this limitation?

Is there a release upgrade feature like Ubuntu has?

Negative, upgrade is possible but not recommended in the raspi docs. There can happen too many things that will brick the whole system.
A fresh install would be better.

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This skip os check command worked for me today when I had this same problem, but now my cpu is running way over 100%.