Copying from the Bitbucket upgrade guide:-
Upgrading to any later version is free if you have current software maintenance.
More about the active server maintenance,
Hey Community! I work on the Bitbucket product marketing team. With Halloween approaching, we wanted to discuss a topic tailor-made for October: development horror stories. Whether it was a lurk...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events