The GitGuardian application can be updated through the admin console in the "Version History" tab. First, you need to check for updates. This can be done manually or automatically. Then, you can deploy an newer version by clicking the "Deploy" button. You can find more information here.
During upgrades, workers are stopped but new commits are still queued, and will be processed after the upgrade. Upgrades do not stop the dashboard, but they introduce a temporary delay for message processing and alerting. We advise to run upgrades during a low traffic period.
Kots also needs to be upgraded. Upgrade instructions are available here.