How do I update my iPhone 6s?

There are no new updates for the iPhone 6s.

If you want to run iOS 16, you will need an iPhone 8, iPhone 8 Plus or iPhone X.

If you want to run iOS 18, you will need an iPhone XR or higher model, but since you will be looking for a new phone, it would make sense to choose a model that will be supported with updates for the next 7-8 years. That would be an iPhone 15 or iPhone 16.

You can update your iPhone 6s to the latest release of iOS 15 – currently iOS 15.8.4.

Update your iPhone or iPad - Apple Support

Updating iOS: common issues and solutions - Apple Community

You cannot update it to iOS 16 or higher. If you need or want to run something higher than iOS 15.*, it is time to purchase a new iPhone, preferably one that is compatible with iOS 18, will be compatible with iOS 26, and has several years of updates ahead of it.

Like, say, an iPhone 15- or 16-series phone. (Or, if you can wait until later this year, one of the new iPhones that would be extremely likely to come out then.)

The iPhone 6s has reached the end-of-life support for Software Updates to the latest iOS operating system, depriving you of features created years ago.

You are invited to visit an Apple retail store to discuss your iPhone upgrade options.

Learn about the ⇢ iPhone Upgrade Program. ⇠📲

Good luck! 👋🏼😉

An iPhone 6S cannot be updated beyond 15.8.4, it doesn't have the hardware needed to run anything higher.

If you need to run a higher operating system, you will need to purchase a newer phone.