diff --git a/manifests/swh/apt_config.pp b/manifests/swh/apt_config.pp
index ec790e7..5e3ceef 100644
--- a/manifests/swh/apt_config.pp
+++ b/manifests/swh/apt_config.pp
@@ -1,17 +1,22 @@
 # Base class for Software Heritage-specific apt configuration
 
 class profile::swh::apt_config {
   include ::apt
 
+  class {'::apt::backports':
+    pin => 100,
+  }
+
   $swh_mirror_location = hiera('swh::debian_mirror::location')
   ::apt::source {'softwareheritage':
     comment        => 'Software Heritage specific package repository',
     location       => $swh_mirror_location,
     release        => $::lsbdistcodename,
     repos          => 'main',
     allow_unsigned => true,
+    notify_update  => true,
   }
 
-  Apt::Source <||> ~> Exec['apt_update'] -> Package <| provider == 'apt' |>
+  Class['apt::update'] -> Package <| provider == 'apt' |>
 
 }