Spring Boot 4.0 Draft Release Notes

Upgrading from Spring Boot 3.5

Since this is a major release of Spring Boot, upgrading existing applications can be a little more involved that usual. We’ve put together a dedicated migration guide to help you upgrade your existing Spring Boot 3.5 applications.

If you’re currently running with an earlier version of Spring Boot, we strongly recommend that you upgrade to Spring Boot 3.5 before migrating to Spring Boot 4.0.