New Gate Code is a written note found in Dishonored 2.
Transcript
Attention everyone!
The new code for the gates is [three digit number].
Once you've read and memorized it, destroy the note. Remember - do not write them down or forget to destroy the notes.
Major Allain Binoche
Location
It can be found inside an office on a desk with a sleeping Grand Guardsman nearby during the mission The Clockwork Mansion.
Trivia
- The gate code is random.