Now that bullseye Raspberry Pi OS¹ images have been officially released I will no longer support buster armhf builds.
New backports for MPD packages will be done against Bullseye Raspberry Pi OS.

The latest MPD backport available for buster will be then MPD 0.23.2.

kaliko repositories

Pay attention: Releasing the new bullseye-backports suite means the stable-backports suite will also be updated to point to bullseye-backports.

Check your apt source list is mentioning the right release code name (buster-backports for instance) instead of the “floating” stable name (ie. stable-backports).
Here is a easy way to control you have the correct URL:

# To run in your shell as a regular non privileged user
distribution=$(lsb_release -si|tr '[:upper:]' '[:lower:]')
release=$(lsb_release -sc)
# This will print the correct URL for this host, check your conf in /etc/apt
echo "https://deb.kaliko.me/${distribution}-backports/ ${release}-backports main"

When will it happen

In the next days, weeks, hopefully by the end of the year.

Consult the dedicated page for more information about how to set the repository.