iOS 14.8, released on Monday, has a critical security upgrade for vulnerabilities that could see people hack iPhones and potentially use them for surveillance.
Researchers from the University of Toronto's Citizen Lab said the software exploit could have been in use since February.
The major issue with the security flaw is that it's not believed any action needed to be taken for a phone to be controlled.
Apple credited the Citizen Lab researchers for finding the vulnerability, but they did not comment further.
To update your iPhone, you need to head to Settings, then General and click Software Update.
If you are connected to Wifi, and your phone is on charge, you should be able to update straight away.