On Monday, Apple released new software updates to address a critical security vulnerability. The alert pertains to all Apple devices including iPhones, iPads, Apple Watches, and Mac computers. The emergency software release can protect against a “critical vulnerability” recently discovered by the University of Toronto’s cybersecurity watchdog, Citizen Lab. Researchers there found that a Saudi activist was infected with spyware known as “Pegasus” from an Israeli tech firm. The spyware uses a “zero click remote exploit” method, which allows someone to infect a device without the user knowing it.

While the typical iPhone user would not likely be a target of such an exploit, experts still warn it’s better to play it safe and upgrade with the new software release as soon as possible. Check your device settings for the software update which was made available on Monday.