Postgres 13 package on Debian 10 has unmet dependencies

Hi list.

As the subject states, I am facing an unmet dependency issue with libpq5
while installing Postgres 13 on Debian 10.9. (BTW, same thing happens with
PG 12).

I am using postgresql repository:

*# cat /etc/apt/sources.list.d/pgdg.list *
deb http://apt.postgresql.org/pub/repos/apt buster-pgdg main

*# apt install postgresql-13 postgresql-client-13*
Reading package lists... Done
Building dependency tree
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:
postgresql-client-13 : Depends: libpq5 (>= 13.3) but 11.12-0+deb10u1 is to
be installed
E: Unable to correct problems, you have held broken packages.

When looking for libpq5 available versions only v11.12 is listed.

*# apt search libpq5*
Sorting... Done
Full Text Search... Done
libpq-dev/stable 11.12-0+deb10u1 amd64
header files for libpq5 (PostgreSQL library)

libpq5/stable 11.12-0+deb10u1 amd64
PostgreSQL C client library

libpq5-dbgsym/buster-pgdg 13.3-1.pgdg100+1 amd64
debug symbols for libpq5

I could get around this by manually installing the correct libpq5 version,
but I still wanted to share this issue with the list. Could it be a
packaging error?

Thanks,
Fernando.