[Tails-dev] Bash & NSS & more? Is it safe to update in curre…

I can see there are new updates for bash and NSS packages. Is it safe to update in current TAILS with each reboot in Synaptic or with apt-get?

How am I to determine which packages are safe to update per session without breaking something in the TAILS design? Thank you for your dedication to TAILS.

RE: NSS - (Security Advisory 2014-73)
https://www.mozilla.org/security/announce/2014/mfsa2014-73.html