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= What's New in Spring Security 6.4

Spring Security 6.4 provides a number of new features.
Below are the highlights of the release, or you can view https://github.com/spring-projects/spring-security/releases[the release notes] for a detailed listing of each feature and bug fix.

- https://github.com/spring-projects/spring-security/issues/4186[gh-4186] - Support `RoleHierarchy` in `AclAuthorizationStrategyImpl`
- https://github.com/spring-projects/spring-security/issues/15136[gh-15136] - Support `RoleHierarchy` Bean in `authorizeHttpRequests` Kotlin DSL

