Update *Tor Browser* to [13.5.7](https://blog.torproject.org/new-release-tor-browser-1357), which fixes [MFSA 2024-51](https://www.mozilla.org/en-US/security/advisories/mfsa2024-51/), a major use-after-free vulnerability. Using this vulnerability, an attacker could take control of *Tor Browser*, but probably not deanonymize you in Tails.
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]].