How can I update my software to current OS on my 2012 MacBook Pro?

"How can I update my software to current OS on my 2012 MacBook Pro?: Currently running macOS Catalina 10.15.7"

-------

You Can't. Your device will only go to 10.15.7.

Your device 2012 is incompatible with post Catalina. So, take this as a good reason to upgrade.

Compare the Results:

• macOS Catalina - Technical Specifications - Apple Support

• macOS Big Sur - Technical Specifications - Apple Support

You cannot.

Catalina is the newest version of macOS that the 2012 MBP can run.

If you wish or need to run a newer OS, you'll have to buy a newer computer.