WhatsApp on iphone5

Do you have an iPhone 5 or iPhone 5s?

iPhone 5 is too old, and does not have the horsepower to run iOS 12.5.6. Extra RAM on newer iPhone 5s can run iOS 12.5.6

If you do have an iPhone 5, you will need a new phone if you want to run any higher iOS system.

Is there a way of updating my iOS 10.3.4 on my iphone 5 to iOS 12 so I can still use whatsApp on it?

Yes and No

Yes, if your iPhone 5 really is an iPhone 5s.

No, if your iPhone 5 is just that, an iPhone 5.

Ask Whatsapp.