Can't update to current software version

Configuration
1

I’ve taken over ownership of a HA setup and I’m learning how to use it. My system has the following software versions (copied from the Settings/About page of my HA account):
Home Assistant 2022.11.4
Supervisor 2025.08.3
Operating System 9.5
Frontend 20221108.0

The system works well but there is a warning in Settings stating “Unsupported system - os_version” and a recommended update “Home Assistant Core Update 2025.8.3”. I’d like to update to the latest versions of all the software. I’m able to update my software to:
Home Assistant 2025.8.3
Supervisor 2025.08.3
Operating System 9.5
Docker 20.10.22

However, I can’t get any further updates. I’ve tried using the 3-dot menu to enable skipped updates and using the CLI to update to the latest OS version but I get messages that say no further updates are available. If anyone can suggest another approach to get the latest updates, I would very much appreciate it.

2

What hardware is your HA instance running on?

Is it using 32-bit architecture?

3

HA is installed on a Dell WYSE thin client, 2020 vintage, with an Intel Celeron J4105 64-bit microprocessor.

4

I would probably just save a backup to a external drive and then do a fresh install.

You might want to scan through the release notes between 2025.8 and now to get an idea of the breaking changes that you’re likely to have. The biggest ones that comes to mind are Template entities and a number of notification integrations like ntfy, Telegram Bot, SMTP, etc.

5

I will give that a try. Many thanks.