Proper way to upgrade PHP version

#1
Hi, I run OLS on the Ubuntu 18.04 (from cloud image). Is there any proper way how to upgrade PHP version? Now default is 7.3 but I would like to have 7.4.

I know I can install lsphp74 package but changes in configuration of server seems to be not working.
Should I wait to some newer version of OLS (currently on the edge repo) which will be compatible with 7.4?
Just would like to know the drill when upgrading PHP on the OLS.

Thanks!
 
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