The React project published version 19.3.1 on 14 October 2026, according to its release page on GitHub. The page lists one change, in React Server Components. These are React parts that run on the server and send results to the browser. The change improves the transport protocol, which is the set of rules for moving that data. The page credits pull request 37845 to the contributors unstubbable and eps1lon. It shows eps1lon as the person who made the release, at 17:06 that day. GitHub marks it as the latest version.
The release page does not explain what the protocol change does. It does not say whether it fixes a bug, closes a security hole, or makes things faster. It also does not say whether users need to change any code. No other changes are listed. The page shows 41 commits added to the main branch since the release, but gives no detail on them.
Teams that use Server Components can read pull request 37845 before they update, because the release notes alone do not say what changed in the protocol.