Applying the most recent security updates to your device’s operating system is a best practice security fundamental. If you’re not running the latest version of an OS, you’re opening your device to potential exploits.
This is a chart of Apple’s iOS 9 adaptation rate.
Trading places – iOS 9 was released on September 16, 2015 and very quickly swapped places with iOS 8 and then accounted for the majority of all installations.
This is a chart of Google’s Android OS adoption rates.
Nowhere to be seen – Android 6.0 “Marshmallow” was released on October 5, 2015 and still rates as “Other”. According to Google’s own figures, the latest version of Android only accounts for 1.2% of Android’s distribution. Approximately 70% of Android devices are still running either Kit-Kat or Lollipop (which have known security issues and vulnerabilities).
Lollipop has even gained market share since Marshmallow’s release.
And that’s a pity, because Android 6.0 Marshmallow has better defenses against trending Android malware.