My iphone is not updating whatsapp

Hello harshjot,

Thanks for using the Apple Support Communities. We understand that you're running into an issue with WhatsApp updates. Try out the actions provided in article, If you can’t download or update apps on your iPhone or other Apple device. In addition to the steps from the article, you can also try offloading the app and reinstalling. To do this, go to Settings > General > iPhone Storage > WhatsApp > Offload App, and then select Reinstall App.

Best regards.