I have macOS 10.14.6 Mojave. It had installed php 7.1.33 initially.
I would like to upgrade php 7.3 using brew install.
I executed brew instal php@7.3 and it was succeed.
However the original php7.1.33 is sticked in /usr/bin/php.
I tried remove or rename the php with sudo mv php php_org.
But it does not work. Operation not permitted.
What is wrong?
Please tell me some advice.