These are valid upgrade paths for Continuous Delivery for Puppet Enterprise (PE).
|If you're on version...||Upgrade to version...||Notes|
|4.21.0||You're up to date!|
|4.x (any version in the series)||4.21.0 (current version)||You can safely upgrade from any 4.x version to any newer 4.x version.|
|3.13.8||4.x (any version in the series)||You must upgrade to the latest 3.13.x version in order to access the 3.x to 4.x data migration tool, and then you can upgrade past 3.13.x.|
|3.13.3 or earlier||3.13.8|