# [unreleased] Improvements: * Add support for historical uppercase MXIDs # 0.14.1 Breaking changes: * Our Minimum Supported Rust Version is now 1.36.0 * This is done in a patch version because it is only a documentation change. Practially, a new project using even ruma-identifiers 0.14 won't build out of the box on older versions of Rust because of an MSRV bump in a minor release of an indirect dependency. Using ruma-identifiers with older versions of Rust will potentially continue to work with some crates pinned to older versions, but won't be tested in CI. Improvements: * Remove the dependency on `lazy_static` and `regex` * We now support [historical user IDs](https://matrix.org/docs/spec/appendices#historical-user-ids)