If you upgrade iOS with iTunes, your device will be un-jailbroken and Cydia packages will be deleted. Before upgrading iOS, make sure a jailbreak is available for the new version.

Can I upgrade/downgrade iOS to any version? What is SHSH?

Where can I find reliable jailbreaking news and help?

Which free tools can I use to jailbreak eligible iOS versions?

As of September 8, 2015

No jailbreak for 8.4.1

Currently there is no jailbreak for iOS 8.4.1. Avoid upgrading or restoring if you want a jailbroken device.

If you want to wipe all data on your device without upgrading the iOS, consider trying Cydia Impactor.

For frequently updated news, see /r/jailbreak on Reddit.

Untethered jailbreak for 8.1.3-8.4

TaiG has released an untethered jailbreak for iOS 8.1.3-8.4.

You can download it from http://www.taig.com/en/ for Windows and Mac.

For news, follow @TaiG_jailbreak.