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tlmgr itself needs to be updated.
Please do this via either
tlmgr update --self
or by getting the latest updater for Unix-ish systems:
[mirror.ctan.org/systems/texlive/tlnet/update-tlmgr-latest.sh](https://mirror.ctan.org/systems/texlive/tlnet/update-tlmgr-latest.sh)
and/or Windows systems:
[mirror.ctan.org/systems/texlive/tlnet/update-tlmgr-latest.exe](https://mirror.ctan.org/systems/texlive/tlnet/update-tlmgr-latest.exe)
Then continue with other updates as usual.
===============================================================================
tlmgr: Terminating; please see warning above!
Otherwise it fails with: