Docker container error

I’ve had a “Watchtower” Docker container that’s been working properly for months. Now I get the following error message:

Error response from daemon: client version 1.25 is too old. Minimum supported API version is 1.44, please upgrade your client to a newer version

I updated “docker-ce” and “docker-cli” to 1.52, deleted the container, downloaded a new image, and reconfigured the container, but I still get the same error message.
I also rebooted the OS before reconfiguring everything, but that didn’t help. I don’t know what else to check or change. Thanks for your help.

This has nothing to do with DietPi. Docker changed the minimum API version. See similar reports in the forum or at Portainer GitHub Failed Loading Environment · Issue #12925 · portainer/portainer · GitHub

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