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It is currently impossible to manually upgrade a Tails USB stick while running from itself. This scenario requires creating an intermediary Tails on another USB stick, from which to upgrade your Tails.
Windows 7
or later
macOS 10.10
Yosemite
Linux
any distribution
Debian
Ubuntu
or another derivative
2 GB of RAM
<a href="https://support.microsoft.com/en-us/windows/32-bit-and-64-bit-windows-frequently-asked-questions-c6ca9541-8dce-4d48-0415-94a3faa2e13d">64-bit</a>
Intel processor
not Apple M1 or M2
<a href="https://www.howtogeek.com/198615/how-to-check-if-your-linux-system-is-32-bit-or-64-bit/">64-bit</a>
1 hour in total
½ hour
¼ hour
½ hour to install
½ hour to upgrade