Ant Vaset upgraded the CQL library to version 4.0.0 in the cqframework/clinical-reasoning repository, focusing on improving reliability and maintainability. He refactored Java code to enhance logging and library content handling, which increased observability and runtime stability. By removing deprecated Maven dependencies, he streamlined the build process and reduced technical debt. Ant also addressed path argument handling and enforced code cleanliness using Spotless, ensuring future maintainability. His work centered on delivering tangible business value through clean, future-ready code. Throughout the month, he applied his expertise in API development, Java, and Maven to deliver a robust, maintainable solution.