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Guix and its package collection are updated by running guix pull
(see Invoking guix pull). By default guix pull downloads and
deploys Guix itself from the official GNU Guix repository. This can be
customized by defining channels in the
~/.config/guix/channels.scm file. A channel specifies a URL and branch
of a Git repository to be deployed, and guix pull can be instructed
to pull from one or more channels. In other words, channels can be used
to customize and to extend Guix, as we will see below.
Guix is able to take into account security concerns and deal with authenticated
updates.