Redmine 4.0.0, 3.4.7 and 3.3.9 released
- a major change to email notifications: each user now receives its own notification email whereas previous versions were sending a single email to all the notified users
- many improvements to text formatting
- the replacement of Coderay by Rouge to support more languages for code highlighting
Email delivery now relies on Rails ActiveJob. Emails are sent asynchronously by default. But you should consider configuring a persistent backend for ActiveJob since the default uses an in-memory queue that is not well suited for production environnements:
Redmine 4.0.0 uses Rails 5.2.2, the latest Rails version released a few days ago.
Redmine 3.4.7 and 3.3.9 are maintenance releases for 3.4.x and 3.3.x users. You can review the details in the Changelog. They both include an upgrade to Rails 4.2.11 that fixed 2 Rails vulnerabilities. Although these vulnerabilities does not affect Redmine 3.x, you should upgrade if possible.