We release new versions of Bitbucket Server frequently. As a Bitbucket Server developer it's important that you're aware of the changes. The resources below will help you keep track of what's happening.
Our API changelog is available here.
In the Atlassian Developer blog you'll find handy tips and articles related to Bitbucket development.
Check it out and subscribe here: Atlassian Developer blog (Bitbucket-related posts).