Although it would theoretically possible for a user to update the version of CDT used in our IDEs, this is not something we would recommend or support.
We will be updating the CDT version used by MCUXpresso IDE from the current CDT 9.1 in a future release, though we can't currently give details of the date of the change or the exact version we'll be moving to.
Regards,
MCUXpresso IDE Support