Apple on Monday released iOS 4.3.5. You can download the new update by connecting tethering your iPhone to your Mac, opening iTunes and clicking the Update button.

iOS 4.3.5 offers a security fix associated with certificate validation, according to Apple. The update is compatible with the iPhone 4 (GSM model), iPhone 3GS, iPad 2, iPad, and third- and fourth-generation iPod touch.

An update with the same change for iPhone 4s on Verizon’s network (4.2.10) is also available.

Check Apple’s Web site for details about the security fix.