https://docs.gitlab.com/ee/update/index.html#upgrading-to-a-new-major-version
Upgrading the major version requires more attention. Backward-incompatible changes and migrations are reserved for major versions. Follow the directions carefully as we cannot guarantee that upgrading between major versions is seamless.
A major upgrade requires the following steps:
- Start by identifying a supported upgrade path. This is essential for a successful major version upgrade
https://docs.gitlab.com/ee/update/index.html#upgrade-paths
backup all three volumes just in case
docker-compose up -d