Worked on foundational improvements in Lean-based projects, focusing on toolchain management and numeric correctness. Upgraded the leanprover/KLR repository to Lean4 4.15.0, aligning the project with the latest stable release to ensure compatibility and streamline future development. In opencompl/lean4, addressed a type system issue by correcting the Float32.ofInt function to return the proper Float32 type, improving reliability in floating point arithmetic and reducing downstream errors. Leveraged expertise in Lean, floating point arithmetic, and type systems to deliver targeted enhancements. The work emphasized maintainability and correctness, supporting both ongoing development and the onboarding of future contributors.