How to update iPhone 6 into iOS 13.4

iOS 12.5.7 is the latest iOS security update for iPhone 6.

Go to Settings -> General -> Software Update -> Download and Install (if you haven't already done that).

iPhone 6 can’t be update to a higher iOS (13 and later). 

Yes, most apps require iOS 13.4 or later.                                

Considering a newer type of iPhone?

Read this before you buy a newer type iPhone.

How do I update my iPhone 6 to iOS 13.4

Thank you very much

See what posted.

How do I update my iPhone 6 to iOS 13.4

This is not possible. iOS 12.5.7 is the last update for the iPhone 6

An iPhone 7 can run iOS 15

An iPhone 8 and higher can run iOS 16