In Xcode, open the Project Navigator, select the package, and click Update Package:

Xcode will automatically fetch the latest compatible version.
If you’re using ITGPlayerViewController or any other ITG plugins, you’ll need to update the import statements in your classes.
Since ITG switched from distributing source code to providing compiled frameworks, there was a module/class name shadowing issue. As a result, the module names were updated:
Only the import definitions need to be changed. For example:
import ITGPlayerViewController
should be updated to:
import ItgPlayerViewController
The class names themselves remain unchanged, so existing code like:
var playerController = ITGPlayerViewController()
does not need to be modified.
Manually update the version number to the latest available release
(check the package repository tags to find the most recent version):