Tails includes an automatic mechanism to upgrade a USB stick to the latest version of Tails. When an automatic upgradeis performed, only an *upgrade package* is downloaded. The upgrade package contains all the changes made to Tails since Tails was first installed or was last manually upgraded.
To check which version of Tailsyou are currently running, choose <span class="menuchoice"> <span class="guimenu">Applications</span> ▸ <span class="guisubmenu">Tails</span> ▸ <span class="guimenuitem">About Tails</span></span>.
In the **About Tails** utility, you can click **Check for Upgrades** to check whether a new version of Tailsis available. This check is also done automatically every time you start Tailsand connect to the Tor network.
After starting Tailsand connecting to Tor, <span class="application">Tails Upgrader</span> automatically checks if upgrades are available and then proposes you to upgrade your USB stick. The upgrades are checked for and downloaded through Tor.
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The advantages of this techniqueautomatic upgrades are the following: