As I posted earlier, Amazon's been pushing the
latest software update to devices gradually. This is done automatically when your Echo's idle. The latest version is 2171 (from 2100).
[Note: A new Echo update (2221) was just released within the last few hours. It may be a number of days before it's pushed to all devices.]
You can check the device's software version in the Echo app by clicking on Settings. Next, select the top menu choice (name of your Echo). Then scroll down to Echo Software Version.
Mine hasn't updated yet. Atunah's hasn't either. Is anyone else still waiting for the updates?