# Flutter Versions This workspace builds against the open Flutter fork configured in `SHOREBIRD_FLUTTER_GIT_URL`, which defaults to: ```text https://github.com/tony-cloud/flutter.git ``` Use `shorebird flutter versions list` to inspect versions known to the local artifact mirror. Prefer passing `--flutter-version` explicitly to release commands so releases and patches resolve the same engine artifacts. ## Supported Flutter Versions Supported versions are the versions for which this workspace has built and published matching engine artifacts into the configured artifact mirror. The default mirror is: ```text http://localhost:8080/artifacts ``` If a version is missing, build the matching custom engine artifacts in CI and publish the generated mirror metadata before creating releases for that version.