Spring Boot 4.0.0-M3 has been released and is accessible via Maven Central. This release incorporates 98 enhancements, documentation updates, dependency upgrades alongside bug fixes, introducing features like Jackson 3 requirement and Kotlin Serialization support. The release includes improvements to MongoDB health indicators and default enabling of liveness and readiness probe endpoints. The release notes provide comprehensive details, and community contributions are encouraged through issue reporting, pull requests, and usage of the Spring Boot tag on Stack Overflow.