We have updated our Kubernetes based Vault setups to the latest version 1.6.1 in the past days.
This release contains mostly bug fixes and 2 CVE fixes (nobody was affected by this).
For full details and other changes, please refer to the upstream Vault release notes: https://github.com/hashicorp/vault/blob/master/CHANGELOG.md#161
There are no next steps needed. All clusters have been upgraded.