Sonos keeps getting better by providing free software updates. Your Sonos system needs to be registered to receive updates.
Set software update preferences
You can have Sonos send you an alert when a software update is available.
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Choose Settings -> Advanced from the Manage menu (PC), or choose Preferences -> Advanced from the Sonos menu (Mac).
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On the General tab, select the Automatically check for updates box if you want Sonos to check for software updates.
Click 
Update Now to get started.
You can also check for software updates by selecting Check for Software Updates from the Manage menu (PC) or Sonos menu (Mac).
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Your Sonos products will all be updated as they must carry the same software version number. This process may take several minutes, depending on your network connection.
Caution:Do NOT unplug any of your Sonos product(s) during the update. Contact Sonos Customer Support if an error occurs.
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Every mobile device that has the Sonos app installed must also be updated.
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You may need to update when you purchase a new Sonos product, or if you plug in a Sonos product that wasn’t in use the last time you updated. If one speaker’s software version is out of sync, a message will display in the ROOMS pane. Click the outdated speaker to begin the software update process.
For additional information, go to http://faq.sonos.com/updateissue.