How can I update WhatsApp on my iPhone XR?

WhatsApp requires iOS 15.1 or later. Your iPhone XR as stated in your tagline is still on iOS 15, but can be updated to the latest iOS 18. Please start by updating to that to ensure your device is compatible with WhatsApp, then try performing the update.

Delete the app on your iPhone and download another copy from the Apple App Store in your country or region.