This a stable release suitable for Testnet, Devnet and Mainnet Beta.
https://github.com/anza-xyz/agave/blob/v4.0/CHANGELOG.md
What's Changed
- v4.0: feat(ci): fetch channel pin overrides from master (backport of #12285) by @mergify[bot] in #12430
- v4.0: status_cache: warn on dup signatures (backport of #12403) by @mergify[bot] in #12426
- Bump version to 4.0.0 by @github-actions[bot] in #12533
Full Changelog: v4.0.0-rc.1...v4.0.0