# Changes and updates
* Update _Tor Browser_ to [10.5.4](
https://blog.torproject.org/new-release-tor-browser-1054).
* Update _Thunderbird_ to [78.12](
https://www.thunderbird.net/en-US/thunderbird/78.12.0/releasenotes/)
# Fixed problems
* Prevent _Tails Installer_ from deleting a Persistent Storage when doing a manual upgrade and choosing **Cancel** in the confirmation dialog. ([#18494](
https://gitlab.tails.boum.org/tails/tails/-/issues/18494))
For more details, read our
[changelog](
https://gitlab.tails.boum.org/tails/tails/-/blob/master/debian/changelog).
# Known issues
None specific to this release.
See the list of [long-standing
issues](
https://tails.boum.org/support/known_issues/index.en.html).
# Get Tails 4.21
## To upgrade your Tails USB stick and keep your persistent storage
* Automatic upgrades are available from Tails 4.19 or later to 4.21.
* If you cannot do an automatic upgrade or if Tails fails to start after an automatic upgrade, please try to do a [manual upgrade](
https://tails.boum.org/doc/upgrade/index.en.html#manual).
## To install Tails on a new USB stick
Follow our installation instructions:
* [Install from Windows](
https://tails.boum.org/install/win/index.en.html)
* [Install from macOS](
https://tails.boum.org/install/mac/index.en.html)
* [Install from Linux](
https://tails.boum.org/install/linux/index.en.html)
The Persistent Storage on the USB stick will be lost if you install instead of
upgrading.
## To download only
If you don't need installation or upgrade instructions, you can download Tails
4.21 directly:
* [For USB sticks (USB image)](
https://tails.boum.org/install/download/index.en.html)
* [For DVDs and virtual machines (ISO image)](
https://tails.boum.org/install/download-iso/index.en.html)
# What's coming up?
Tails 4.22 is [scheduled](
https://tails.boum.org/contribute/calendar/) for
September 7.
Have a look at our [roadmap](
https://tails.boum.org/contribute/roadmap) to see
where we are heading to.
URL:
https://tails.boum.org/news/version_4.21/index.en.html
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