diff --git a/modules/nixfiles/nixfiles-system-upgrade.nix b/modules/nixfiles/nixfiles-system-upgrade.nix
index 2b8bbcd..a3f29b7 100644
--- a/modules/nixfiles/nixfiles-system-upgrade.nix
+++ b/modules/nixfiles/nixfiles-system-upgrade.nix
@@ -27,7 +27,14 @@ in
         Type = "oneshot";
         ExecStart = pkgs.nixfiles-system-upgrade + "/bin/nixfiles-system-upgrade --no-confirm${optionalString cfg.allowReboot " --allow-reboot"}";
       };
-      startAt = "*-*-* 06:47:00";
+    };
+    systemd.timers.nixfiles-system-auto-upgrade = {
+      wantedBy = [ "timers.target" ];
+      timerConfig = {
+        OnCalendar = "*-*-* 05:37:00";
+        RandomizedDelaySec = "2h";
+      };
+      after = [ "network-online.target" ];
     };
   };
 }