How to update from 1.7.2 to 1.7.3

[Soldier2003]

I'm not sure how to correctly identify the version, but I definitely remember adding a repository.
If I run
dpkg -l | grep self-service-password
ii self-service-password 1.7.2-1 all LDAP password change web interface
the output shows version 1.7.2-1.
Currently, the latest version is 1.7.3. The documentation clearly highlights sections about updates between major versions, for example, from 1.6 to 1.7.
How can I update my version to the latest?

[coudot]

You can see that 1.7.3 is in the debian repository: https://ltb-project.org/debian/stable/pool/main/l/ltb-project-self-service-password/

Check your apt repository configuration: https://self-service-password.readthedocs.io/en/stable/installation.html#debian-ubuntu