Balmukund Mandal focused on security hardening and dependency management within the OpenLineage/OpenLineage repository during October 2025. He addressed a known vulnerability by upgrading the commons-lang3 dependency from version 3.14.0 to 3.18.0 in the Gradle build configuration for the integration/sql/iface-java module. This targeted security patch directly mitigated a CVE, reducing exposure for enterprise deployments while preserving API compatibility and passing continuous integration checks. His work demonstrated careful dependency hygiene and a minimal-risk approach, leveraging skills in Gradle and security patching. The update was delivered as a single, auditable commit, ensuring transparency and maintainability for future development.