Update error - Home Assistant Supervisor

Dear community.
I get an error while trying to update the “Home Assistant Supervisor”.
Here is the error message, that I get, when I try to update via the terminal:

Error: Update of Supervisor failed: Can’t install ghcr.io/home-assistant/aarch64-hassio-supervisor:2024.12.3: 500 Server Error for http+docker://localhost/v1.47/images/create?tag=2024.12.3&fromImage=ghcr.io%2Fhome-assistant%2Faarch64-hassio-supervisor&platform=linux%2Farm64: Internal Server Error (“Get “https://ghcr.io/v2/”: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)”)

I use pi-hole DNS (on a seperate device) - does HA get blocked by this?
Can anyone help me find the problem, please?