Google released the monthly security update and it's a big one. The update plugs a critical flaw that enabled remote code execution by email, web browsing, and MMS. This update should be applied as soon as possible so keep an eye out for your device.
Latest figures of Android versions in use show that Marshmallow adoption has doubled since last month. It's now installed on 4.6 percent of Android devices which is not a large number given the way the system works.