The Docker deployment of Secure API Manager does not perform an automatic checks to see if there are upgrades available for it. You must check Docker Hub every three or so months to see if there is an update available.
To check for available upgrades for the Docker deployment of Secure API Manager:
Access the Secure API Manager Docker Hub URL.
Search for sapim-agent or sapim-gateway.
Select an image name, then select Tags.
Manually check to see if newer version available than you current version.
(Conditional) If there is a newer version available, run the Docker upgrade script using the new version number to upgrade your Docker deployment.