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Re:Tmux 2.0 released by tomswartz07 on Thursday May 07, 2015 @11:25AM (#9505729)
The release notes don't say:

Is this a session-breaking update?

I'd hate to run the update only to have it kill my current TMUX session.

Devs - if you're reading this: PLEASE indicate if I could update without restarting the session.

Re:Tmux 2.0 released by sikhnerd on Thursday May 07, 2015 @11:38AM (#9505828)
Does not appear to be a session-breaking update. I just updated with no ill effects.
Re:Tmux 2.0 released by thomasadam on Friday May 08, 2015 @08:28AM (#9511168)
Actually, I already provide this in the release notes. A PROTOCOL_VERSION bump means restarting tmux. We didn't do this between 1.9a -> 2.0, hence why it wasn't mentioned. Look at the release notes for 1.9, you'll see it was mentioned there. Simples.
Re:Tmux 2.0 released by albemuth on Thursday May 07, 2015 @01:01PM (#9506538)
have you tried something like tmuxinator so create/restore sessions?
Re:Tmux 2.0 released by zserge on Thursday May 07, 2015 @03:50PM (#9507794)
May I suggest a more lightweight alternative for Tmux/Screen/DVTM sessions - http://zserge.com/blog/mucks2.html ?