Spring Boot 4.0 Is Here — And It's a Big Deal 🍃
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Spring Boot 4.0 is the biggest release since the 3.0 jakarta migration. Virtual threads are now the default. GraalVM AOT is first-class. The modular starter redesign cleans up years of dependency bloat. Spring Framework 7 brings built-in API versioning. If you're still on 3.x, your migration window is closing. What Version Are We Even On? As of April 2026, Spring Boot 4.0.6 is the current stable release, and 4.1.0-RC1 just dropped on the Spring blog. Spring Boot 3.5 — the last