Ed Saunders focused on enhancing the security and stability of the UKGovernmentBEIS/control-arena repository by addressing a critical dependency issue. He updated the LiteLLM dependency in the project’s TOML configuration, explicitly avoiding compromised versions in response to a security incident. Through careful dependency management and adherence to security best practices, Ed reduced supply chain risk and improved the repository’s overall security posture. His work involved version pinning, change tracking in Git, and configuration hardening, ensuring downstream services relying on LiteLLM remained protected. This targeted bug fix demonstrated depth in secure software supply chain practices and proactive risk mitigation within the project.