Apple just released an update for iOS. Browse to Settings -> General -> Software Update to fine the latest version now – 11.2.2
New Features in the Latest Version of iOS:
iOS 11.2.2 includes security improvements to Safari and WebKit to mitigate the effects of Spectre (CVE-2017-5753 and CVE-2017-5715).
Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation