How do I update Redmine?

To upgrade Redmine, first check that your environment meets the requirements for the new version. Then, back up your database, files, and configuration to avoid data loss. 

Prepare the new Redmine version, copy your configuration, data and plugins, install required gems, and update the database. Finally, clear the cache, restart the server, and test everything to make sure it works properly.

To update Redmine 5 to Redmine 6, find more in the article.