Aku Kotkavuo upgraded the SWC dependency to version 10.0 in the leptos-rs/cargo-leptos repository, focusing on enhancing build stability and future compatibility. The work involved careful updates to Cargo.toml and Cargo.lock, ensuring lockfile integrity and accurate project metadata. By aligning the project with the latest SWC features, Aku reduced maintenance risk for downstream consumers and improved the upgrade path for future toolchain changes. The technical approach demonstrated proficiency in Rust and dependency management, with thorough validation of build integrity and downstream compatibility. Documentation was provided to guide maintainers, supporting ongoing project maintainability and smoother future dependency upgrades.