2016 MacBook Pro 15-inch unable to update to macOS 13
I have a 2016 MacBook Pro 15-inch running Monterey Version 12.7.6. When I try to update to 13, the message comes back that my Mac is up-to-date. My brother's Mac is much older and he's got the latest OS.
Please help.
MacBook Pro 15″, macOS 12.7