From Jira 12.0, Confluence 11.0, Bitbucket 11.0, Bamboo 13.0, and Crowd 8.0 React is upgraded to v19. com.atlassian.plugins:react web resource will provide react 19 instead of react 18.3.1

Changes in React 19

See the official React 19 Upgrade Guide.

Upgrading Atlassian Plugin

More information on the process and tooling will be provided soon.