how do I get the latest version of safari?

If you are trying to update Safari on an IOS device, is your device compatible to update to the new version? See the article(s) below. 

IOS 15 and iPadOS 15 Compatible Devices.  *

iOS 14 and iPadOS 14 Compatible Devices.  *

iOS 13 and iPadOS are compatible with these devices - Apple Support.  *

iOS 12 is compatible with these devices.   *

IOS 11 is compatible with these devices   *   If you can upgrade to IOS 11, you can upgrade to IOS 12

IOS 10 is compatible with these devices   -

iOS 9 Compatibility & Supported Devices List  -

See the articles below.

Update your iOS device.  -

Get help with over-the-air iOS updates  -

Update – Can’t or can’t restore   -

Have you tried using iTunes on a computer or Finder if running Catalina or later to do the update?

Update software on iOS devices in iTunes on Mac. -

Phone, iPad, or iPod touch - Update with Finder.  *

iPhone, iPad, or iPod touch - Update with iTunes.  *

If you see an error when you update or restore your iPhone, iPad, or iPod    *

Updating iOS: common issues and solutions.  -

ASC YouTube for  how to update your iPhone, iPad, or iPod touch to the latest version of iOS or iPadOS —wirelessly or using your computer.

Safari is updated along with macOS. Update macOS. To learn how to do that, please read How to update the software on your Mac - Apple Support.