By default, SIMP applies :ref:`ug-sa-ga-nightly-updates` from all configured repositories.
This behavior is controlled by the simp::yum::schedule class from the
simp-simp Puppet module and the parameters therein can be used to modify
the schedule.
If you simply want to disable the nightly updates, you can set
simp::yum::schedule::enable to false in :term:`Hiera`.