Worked on the grpc/bazel-central-registry repository to deliver Jsonnet 0.21.0 support, focusing on build system configuration and dependency management using Bazel. Developed a new Bazel module definition and presubmit configuration to ensure seamless integration and compatibility with Jsonnet 0.21.0, updating the jsonnet_go module and associated build files. Enhanced continuous integration and presubmit gating to validate the new version, reducing integration risks for downstream users. These updates improved reliability and testing coverage for developers relying on Jsonnet-based configurations within the Bazel Central Registry ecosystem, demonstrating a methodical approach to maintaining compatibility and stability in complex build environments.