During December 2024, Ryota Sakamo focused on security remediation and dependency management within the smithy-lang/smithy-rs repository. He addressed a vulnerability in the idna dependency by upgrading the url crate to version 2.5.4 across aws-config, aws-inlineable, and the main rust-runtime. Using Rust and Cargo, he updated Cargo.lock files and ensured build compatibility without introducing API changes. His approach consolidated the patch across multiple crates, streamlining future maintenance and reducing the risk surface. By verifying CI test integrity and maintaining dependency hygiene, Ryota demonstrated a methodical approach to vulnerability management and build stability in a complex Rust codebase.