Latest stable version of OpenEBS is 1.10.0. Check the release notes here. Upgrade to the latest OpenEBS 1.9.0 version is supported only from 1.0.0, 1.1.0, 1.2.0, 1.3.0, 1.4.0, 1.5.0, 1.6.0, 1.7.0, 1.8.0, 1.9.0 and the steps for upgrading from these versions can be found here.
Note: If you are upgrading Jiva volumes that are running in version 1.6 and 1.7, you must use these pre-upgrade steps to check if your jiva volumes are impacted by #2956. If they are, please reach out to us on [OpenEBS Slack] (https://openebs-community.slack.com/messages/openebs-users/) or Kubernetes Slack #openebs channel for helping you with the upgrade.
Supported upgrade paths
From 0.9.0 to 1.0.0 - Get the steps from here.
From 0.8.2 to 0.9.0 - Get the steps from here.
From 0.8.1 to 0.8.2 - Get the steps from here.
From 0.8.0 to 0.8.1 - Get the steps from here.
From 0.7.x to 0.8.0 - Get the steps from here.
From 0.6.0 to 0.7.x - Get the steps from here.
From 0.5.3 or 0.5.4 to 0.6.0 - Get the steps from here.
Note: You have to upgrade from your current version to the next version as per the supported path.