Spring Boot releases a new minor version approximately every 6 months, and each version has a defined open source (OSS) support window. If you're running an unsupported version, you're missing security patches and likely out of compliance with enterprise security policies. This guide covers every Spring Boot 2.x and 3.x version with exact OSS and commercial support end dates. Quick answer: Spring Boot 4.0 (released Nov 30, 2025) and Spring Boot 3.5 are the current supported releases. Spring Boot 3.4 OSS support ended December 31, 2025. Spring Boot 3.3 OSS support ended June 30, 2025. All Spring Boot 2.x OSS support has ended — Spring Boot 2.7 commercial support runs to June 30, 2029.…