ROME (AP) — Pope Francis marked the 12th anniversary of his papacy Thursday with increasingly positive medical updates four weeks into his hospitalization for double pneumonia.

The pope spent another tranquil night, the Vatican said in its brief morning statement.

A chest X-ray confirmed improvements, the Vatican said on Wednesday, just two days after days after doctors at Gemelli hospital declared that he’s no longer in imminent danger of death.

The latest medical bulletin said that the 88-year-old pope’s condition remained stable, but indicated a complex picture considering his overall fragility.

He continues to receive high flows of oxygen through nasal tubes during the day, and a non-invasive mechanical mask to aid his rest at night.

His weekly Wednesday general audience was canceled since the Vatican hierarchy is on retreat this week as part of the Lenten spiritual exercises that have been a mainstay of the Jesuit pope’s pontificate. But Francis on Wednesday was able to remotely follow the retreat.

The Holy See hasn’t said how Thursday’s anniversary of his election as the 266th pope might be commemorated. It is a public holiday at the Vatican and Masses are planned in his honor at churches in Rome. No medical bulletins will be issued.

The former Cardinal Jorge Mario Bergoglio was elected on the fifth ballot of the 2013 conclave, which was called after Pope Benedict XVI resigned.

While Francis had praised Benedict’s humility in stepping down and said he might follow in his footsteps, more recently he has said the papacy is a job for life.

Another milestone comes Friday, when Francis marks four weeks of hospitalization.

St. John Paul II has the record for a hospital stay, at 55 days in 1981 when he underwent a minor surgical operation and then was treated for a cytomegalovirus infection.

Francis is on track to equal the second-longest stay, 28 days, which John Paul recorded in 1994 when he had surgery to repair his right hip joint after he fractured his right femur in a fall, according to Gemelli hospital.

The Vatican has released no photos or video of Francis since he was admitted.

The pope recorded an audio message last week to thank people for their prayers, though the weakness and breathlessness of his voice made clear how frail he was.