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I have Mac OSX Yosemite version 10.10.5 and use Safari v.10.1.2 . I often get a notice that my
browser is out of date and cannot use on a website until it is upgraded. Is my entire operating
system out of date or just the Safari browser. Do I need to update both in order to update Safari?
MacBook Pro 15", OS X 10.10
You need Sierra at a minimum to get an up to date browser. Check the computer requirements shown in each link to see if your computer is capable of running that OS version.
How to upgrade to macOS Mojave - Apple Support
Check to make sure your applications are compatible.
macOS Sierra 10.12: Compatible Apps
Also check to make sure there is a compatible driver for your printer.
Do a backup before installing, preferable 2 backups on 2 different drives.
You need Sierra at a minimum to get an up to date browser. Check the computer requirements shown in each link to see if your computer is capable of running that OS version.
How to upgrade to macOS Mojave - Apple Support
Check to make sure your applications are compatible.
macOS Sierra 10.12: Compatible Apps
Also check to make sure there is a compatible driver for your printer.
Do a backup before installing, preferable 2 backups on 2 different drives.
If for other compatibility reasons you cannot upgrade your macOS to newer, FireFox still supports macOS 10.10:
https://www.mozilla.org/en-US/firefox/67.0/system-requirements/
Get FireFox only from the developers' site to avoid unwanted adware/malware:
Yes, you'd need to upgrade your system. Safari is upgraded when the system is upgraded.
Safari 10.1.2 out of date?
