Noves-Inc/canton-data-app: docs/upgrade-4.2.2.md

# Upgrade to 4.2.2 4.2.2 is a security release. Upgrade with the full 4.2.2 bundle, either the Docker Compose bundle or the Helm chart. Changing only the image tag is not supported: the bundle carries the configuration the new backend requires. Upgrade directly from any published release 4.0.0 or la