- Add binary gems for ruby-4.0, now providing ruby-3.0 to 4.0. #682
- Improve documentation of PG::Result and README. #676
- Update errorcodes to PostgreSQL-18.
- Use `rb_hash_new_capa` on Ruby-3.2+ . #674
- Deny any server communication on a frozen PG::Connection . #677
- Fix possible race condition in PG::Result in Ractor context. #674

Removed:
- Drop binary gem support for platform `x86-mingw32`. #682
- Drop binary gems for ruby-2.7.