Caroline Hatwell upgraded the OpenAPI Specification for the NHSDigital/validated-relationships-service-api repository, moving from version 1.14.0 to 1.15.0 to support future enhancements and maintain release readiness. Her work focused on modernizing the API contract, ensuring improved downstream compatibility and reducing risk for upcoming feature development. Caroline applied her expertise in API development and OpenAPI lifecycle management, using YAML to define and document the updated specification. The upgrade provided a clear, traceable path for changes, aligning the service with current standards. Over the month, her contributions demonstrated depth in API design and careful attention to versioning and release processes.