Update iOS, when added to a workflow and deployed to a device, will update the device to the latest available iOS version for that device. Selecting this action lets you make the update conditional to the current iOS version for the device.
As new releases of iOS are made available, Apple will usually continue to sign older versions. Similar to iTunes and Configurator, GroundControl v3.1 and later allows you continue to install older signed versions available to device, even if a newer iOS version is available. Just select “Continue targeting…” in your workflow and we’ll all pretend the new iOS update isn’t there, at least for a while. For additional information, check out our iOS Update FAQ.