Running 10.7 and 10.6 on two production applications with Heroku. Thinking about moving to 11 to ensure support for the long run as I rarely need to touch this and it's very stable but would like to minimize any headaches in the future.

Any complications or hiccups I need to worry about moving from 10 to 11?

Per Heroku Docs: By supporting at least 3 major versions, users are required to upgrade roughly once every three years. However, you can upgrade your database at any point to gain the benefits of the latest version.