Update wanted

To learn more on how to update your iPhone, click here  ➔ Update your iPhone, iPad, or iPod touch - Apple Support

Axel F.

Follow the instructions in the link Axel Foley provided. When you try to update you will only be given one update selection which will be the highest available iOS version supported by your device. If it says the device is up to date and you need a higher OS version you will have to buy newer equipment.