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[[!meta title="Tails 4.2.2 is out"]]
[[!meta date="Thu, 14 Jan 2020 11:00:00 +0000"]]
This release is an emergency release to fix a critical security vulnerability in *Tor Browser*.
Update *Tor Browser* to [9.0.4](https://blog.torproject.org/new-release-tor-browser-904).
This fixes a [[!mfsa 2020-03 desc="critical vulnerability"]]
in the JavaScript JIT compiler of *Firefox* and *Tor Browser*.
Mozilla is aware of targeted attacks in the wild abusing this
This vulnerability only affects the *standard* [[security
level|doc/anonymous_internet/Tor_Browser#security-level]] of *Tor
Browser*. The *safer* and *safest* security levels are not affected.
Fixed problems
Avoid a 2-minutes delay when restarting after doing an automatic upgrade. ([[!tails_ticket 17026]])
For more details, read our [[!tails_gitweb debian/changelog desc="changelog"]].
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Known issues
None specific to this release.
See the list of [[long-standing issues|support/known_issues]].
Get Tails 4.2.2
To upgrade your Tails USB stick and keep your persistent storage
- Automatic upgrades are available from 4.2 to 4.2.2.
Users of Tails 4.0, 4.1, and 4.1.1 have to upgrade to 4.2 first and
then to 4.2.2.
If you cannot do an automatic upgrade or if Tails fails to start after an automatic upgrade, please try to do a [[manual upgrade|doc/upgrade/#manual]].