Updating Liberty on distributed operating systems
Fix packs contain bundled service to bring WebSphere® Application Server Liberty up to a new level. Interim fixes provide corrective service for specific known problems. You can use IBM® Installation Manager Version 1.8.5 or later to update the offering with the fix packs and interim fixes that are available for your service level of WebSphere Application Server Liberty.
Before you begin
![[17.0.0.3 and later]](../ng_v17003plus.gif)
Java SE 8 is the recommended Java SDK because it provides the latest features and security updates. As an alternative to installing Java SE 8, you can install another supported Java SDK version.
For the most current information about upgrades for Liberty offerings, see the IBM Software Support Center and Fix Central.
About this task
- Fix pack
- A fix pack contains bundled service to bring your WebSphere Application Server installation up to a new product level. The product level for the
fix pack is denoted by the last numeral in the version number, such as 2 in
16.0.0.2.
Fix packs are cumulative. When a prerequisite or co-requisite fix pack is recommended, you can install that specific fix pack or a later fix pack. For example, if a functionality requires 16.0.0.2, you can apply 16.0.0.3 or any later fix packs to get it.
New: Fix pack 16.0.0.2 is the next Liberty fix pack after 8.5.5.9. For more information about changes in Liberty fix pack numbering and delivery, see What is new in this release of Liberty.If your current installation is at an 8.5.5.x fix pack, you can update to and roll back from a 16.0.0.2 or later fix pack by using the standard updating procedures.
- Interim fix
- Interim fixes provide corrective service for specific known problems. These fixes are released between fix packs so that you can apply critical updates to your installations as soon as possible.
When you install a fix pack, Installation Manager automatically reapplies any installed interim fixes if they apply to the updated fix pack level. Interim fixes that do not apply, such as if the updated fix pack contains the fix, are uninstalled. In some cases, Installation Manager must uninstall an interim fix that you must manually reapply. For example, you might update to a fix pack that does not contain the fix and requires an updated interim fix level. Installation Manager notifies you if any interim fixes must be manually reapplied. You can verify which interim fixes are installed by running the productInfo version --ifixes command.