When installing a new version of Senzing using the standard yum/apt package management commands, your project(s) will not automatically be updated. They will will continue to work allowing you to upgrade each project at your convenience.
To update a project, run the G2UpdateProject.py script:
python3 /opt/senzing/g2/python/G2UpdateProject.py <project_folder>
G2UpdateProject updates the files in your project folder from the newer and updated Senzing installation. Your configuration files in <project_folder>/etc will not be modified.
Check https://senzing.com/releases/#api-releases for any additional instructions to upgrade to a specific release. There may be schema and configuration update scripts that additionally need to be run to complete an upgrade.
If you are upgrading between multiple versions, for example from 1.10 to 1.12, check the above link for each version between your previous version of Senzing up to the new version now installed.