In March 2021, the Arion 400 series was updated. The 4.5-liter FPT engines equipped with four-valve technology were now Stage V compliant. At the top of the range, the Arion 470 was introduced, with a maximum power output of 155 horsepower. New for the Arion 440 and larger models was increased power. Starting from the Arion 430, the turbochargers were equipped with a wastegate. The standard hydraulics featured an open system pump with a capacity of 60 or 100 l/min. A new feature was a 150 l/min closed system. A 110 l/min closed system was also still available. Electric valves were available as an optional accessory with the closed system. Transmission options remained 16+16 and 24+24, corresponding to MF’s Dyna-4 and Dyna-6 transmissions. Four-wheel drive could now be automatically disconnected when turning the front wheels at the headlands. The top speed was 40 km/h. In the CIS version, in addition to the base model, there were engine speed memory functions, an armrest joystick and display, as well as a 100 l/min pump. The CIS+ featured closed hydraulics, a color display on the A-pillar, and a more multifunctional joystick. The appearance was updated, but the cab remained nearly unchanged. A new version, the Arion 400 M, designed for municipal technical work, was equipped with a 5-post cab and polycarbonate side windows.

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