Cant update FreePBX

Trying to upgrade from v15.0.23 to V16 and upgrader tells me that:
“Your PHP version of 5.6.40 is NOT supported. You must have a version higher than or equal to 7.4”
I can not find any instructions on how to safely update PHP to 7.4

Is there any tool for that?

realized there was missing file /etc/schmooze/pbx-version
Created a file put inside ‘10.13.66-17’ (copied from other pbx) and ran updater again.
All worked and system updated.

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