May 2025 monthly summary for Avail Light Client focusing on security hardening and reliability of validator set handling. Key improvements center on deduplication and sorting of validator set entries and justification to close potential bypass paths for supermajority checks, and a precedence rule ensuring forced validator set changes take priority over scheduled changes when both occur in the same block. Overall, these changes significantly strengthen the integrity of validator updates, reduce risk of misconfigurations, and improve deterministic behavior during transitions in the Avail network. Technologies/skills demonstrated include distributed consensus handling, security-focused code changes, deduplication and ordering logic, and rigorous changelog traceability through precise commit messages.