`aptitude update' won't update

[Rodolfo Medina <rodolfo.medina@gmail.com>]

Please help with this:

# aptitude update
Hit http://dl.google.com/linux/chrome/deb stable InRelease
Get: 1 http://ftp.debian.org/debian stable InRelease [113 kB]
Get: 2 http://ftp.uk.debian.org/debian stable InRelease [113 kB]
E: Repository 'http://ftp.debian.org/debian stable InRelease' changed its
'Codename' value from 'buster' to 'bullseye'
E: Repository 'http://ftp.uk.debian.org/debian stable InRelease' changed its
'Codename' value from 'buster' to 'bullseye'
E: Failed to download some files
W: Failed to fetch http://ftp.uk.debian.org/debian/dists/stable/InRelease: 
W: Failed to fetch http://ftp.debian.org/debian/dists/stable/InRelease: 
E: Some index files failed to download. They have been ignored, or old ones
used instead.


My /etc/apt/sources.list:


----------------------------------------------------------------
deb http://ftp.uk.debian.org/debian/ stable main
deb-src http://ftp.uk.debian.org/debian/ stable main

# non-free
deb http://ftp.debian.org/debian/ stable main contrib non-free

#deb http://repository.spotify.com stable non-free

#deb [arch=amd64] https://repo.skype.com/deb stable main
----------------------------------------------------------------


Thanks in advance for any help...

Rodolfo