»Vault Version
When deploying a new Vault cluster into HCP, you select the major version number you wish to deploy. Currently, Vault v1.7 is the supported major version and more options to come in the future.
The minor versions are upgraded for you automatically (e.g. 1.7.0 to 1.7.1).
However, the major version upgrades are currently not available. It will be
available in the future where the users can manage the version upgrade through
the platform.
NOTE: You cannot pin your Vault installation to a specific minor version.
»Version Policy
Although Vault 1.7 is the only supported major version available today, HCP Vault will support the current major version and two previous major versions in the future.
When a specific version approaches its end-of-life on the HCP, existing users will receive a notification. After proper notification and grace period, HashiCorp will upgrade the clusters to the latest version automatically.