Packages are installed or upgraded to the latest version available in
the distribution currently available on your local machine. To update
that distribution, along with the Guix tools, you must run
pull: the command downloads the latest Guix source code and package
descriptions, and deploys it.
guix package will use packages and package
versions from this just-retrieved copy of Guix. Not only that, but all
the Guix commands and Scheme modules will also be taken from that latest
guix sub-commands added by the update also
guix pull command is usually invoked with no arguments,
but it supports the following options:
Produce verbose output, writing build logs to the standard error output.
Use the bootstrap Guile to build the latest Guix. This option is only useful to Guix developers.