To use the most modern version of Postgres software we need to add postgresql repository. Edit /etc/apt/sources.list
or create /etc/apt/sources.list.d/pgdg.list
and add there a line: deb http://apt.postgresql.org/pub/repos/apt/ jessie-pgdg main
Then import the repository signing key, and update the package lists:
wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
sudo apt-get update
Install a new version of PostgreSQL server.
Once the Debian upgrade finished, I used dpkg-query -l postgresql*
to check which versions of postgres I have installed.