We regularly update stacks by releasing new versions, such updates can include security updates and performance improvements. You can find more details under the Changelog tab on a stack page.
The stack has a requirement for the minimal version of infrastructure of the server where this stack is deployed. You can find a stack's version of your application on the list of your apps or under
Stack tab of your instance. If a stack is outdated you will see an appropriate indicator.
Updating Stack in Organization
When a new version of a stack has been released on Stack Hub your stack will be marked as outdated. You can update a stack to the latest version from a stack page in your organization. The update of a stack will not affect your applications, it only updates the version of a stack inside of your organization.
Upgrading Application Stack
Once you update a stack in your organization, you can upgrade the application instances. Go the
[Instance] > Stack > Operations page and click Upgrade. The downtime depends on the number of services affected in a new version and what deployment strategy used in these services.