Gregory Brancen updated Oklahoma’s 2024 tax year data in the PolicyEngine/policyengine-us repository, aligning tax parameters with current forms, thresholds, and statutory references. He used YAML for structured data management, ensuring that all 2024 tax form URLs and statutory links were accurate and up to date. Gregory also addressed outdated links for prior years, improving the reliability of reference data. His work included comprehensive documentation, adding a detailed changelog entry to enhance auditability and traceability. The update focused on tax policy compliance and data integrity, providing a robust foundation for accurate Oklahoma tax calculations in the PolicyEngine platform.