using pgdg repo

I have installed pgdg-centos-8.3-5.noarch.rpm
Using that repo I installed
compat-postgresql-libs-4-1PGDG.rhel5
postgresql-server-8.3.5-2PGDG.rhel5
postgresql-contrib-8.3.5-2PGDG.rhel5
postgresql-docs-8.3.5-2PGDG.rhel5
postgresql-libs-8.3.5-2PGDG.rhel5
postgresql-8.3.5-2PGDG.rhel5
postgresql-pltcl-8.3.5-2PGDG.rhel5
postgresql-jdbc-8.3.604-1PGDG.rhel5

Now I want to update to PostgreSQL 8.3.6 which i believe is available in
the pgdg repo

# yum update postgresql
Loading "fastestmirror" plugin
Loading mirror speeds from cached hostfile
* pgdg83: yum.pgsqlrpms.org
* rpmforge: apt.sw.be
* base: mirror.skiplink.com
* updates: repo.genomics.upenn.edu
* addons: mirror.newnanutilities.org
* extras: ftp.usf.edu
Excluding Packages in global exclude list
Finished
Setting up Update Process
Could not find update match for postgresql
No Packages marked for Update

What is the prescribed method to perform this update?
If this is not the proper list for this question please point me to a
better resource.

Thanks
Richard