This a stable release.
https://github.com/anza-xyz/agave/blob/v4.2/CHANGELOG.md
What's Changed
- v4.2: Ignore h2 RUSTSEC-2026-258 by @steviez in #14753
- v4.2: TpuClientNext only uses streams. Remove datagram support (backport of #14810) by @mergify[bot] in #14833
- v4.2: Reconstruct V1 messages in storage-proto instead of downgrading them to V0 (backport of #14874) by @mergify[bot] in #14919
- Bump version to 4.2.2 by @github-actions[bot] in #14938
Full Changelog: v4.2.1...v4.2.2