The Vatican has released the first photograph of the pope in more than a month, showing Pope Francis wearing a purple Lenten liturgical vestments sitting in a wheelchair in front of an altar in the hospital chapel.

The 88-year-old pontiff is now able to spend some time during the day off high flows of oxygen and use just ordinary supplemental oxygen delivered by a nasal tube, the Holy See press office said. Doctors are also trying to cut back on the amount of time he uses a noninvasive mechanical ventilation mask at night, to force his lungs to work more.