Detailed release notes are available WordPress.org. However, here are links to more user-friendly release notes. Version 5.9.0 (Coming Soon) Version 5.8.0 Version 5.5.0 Version 5.1.0 Version 5.0.0 Version 4.10 – 4.3.2 Version 4.1.0 Version 4.0.0 Version 3.3.0 Version 3.3.2 Version 3.2.0