Does hass.io supervisor update without asking?

Installation Home Assistant OS
1

Twice now my node-red has randomly stopped working without me touching anything. Both times I’ve noticed that supervisor had a new version that was causing the errors.

Is supervisor updating itself to new versions without asking? Any way to disable this?

2

Yes and not that I know of (respectively).

This is a bit of a worry as I am often away from my house for months at a time and would prefer it be left with a stable system in place.