Worked on the apache/flink-cdc repository to upgrade its test bases and serializer tests for compatibility with Flink 1.20. Focused on build management and Java, the work involved updating dependencies and imports to align with the latest Flink APIs while ensuring that core business logic remained unchanged. Existing tests were leveraged to validate that the upgrade did not introduce regressions, minimizing risk for downstream users and integrations. This approach streamlined the transition to the new Flink version, reducing friction for users and maintainers. The work demonstrated attention to compatibility, testing, and careful dependency management within a Java-based project environment.