trying to install linux-kbuild-5.10

aaron@abox:~$ sudo apt-get install linux-headers-5.10.0-15-amd64
[sudo] password for aaron:
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 linux-headers-5.10.0-15-amd64 : Depends: linux-kbuild-5.10 (>= 5.10.120-1)
E: Unable to correct problems, you have held broken packages.
aaron@abox:~$ apt-cache policy linux-kbuild-5.10
linux-kbuild-5.10:
  Installed: 5.10.106-1
  Candidate: 5.10.106-1
  Version table:
     5.10.120-1 500
        500 http://security.debian.org/debian-security bullseye-security/main amd64 Packages
 *** 5.10.106-1 900
        900 http://deb.debian.org/debian bullseye/main amd64 Packages
        900 http://ftp.de.debian.org/debian stable/main amd64 Packages
        100 /var/lib/dpkg/status