Four contenders are competing for the post, with the successful candidate set to assume office at the start of next year and confront mounting challenges facing the United Nations, whose global standing has come under increasing scrutiny.

During two days of hearings, candidates emphasized the need to modernize the 80-year-old body, established after World War Two, as geopolitical tensions and actions by major powers strain the norms underpinning the post-war international order.

Rebeca Grynspan, former vice president of Costa Rica and current head of the United Nations Conference on Trade and Development, said restoring trust in the institution would be critical, identifying peacemaking as her top priority.

“To defend the United Nations today is to have the courage to change it,” Grynspan said, warning that confidence in the organization was eroding and time to reverse the trend was limited.

Macky Sall, who served as Senegal’s president until 2024, advocated what he described as “rigorous management” reforms aimed at improving coordination across UN agencies and reducing duplication, as pressure mounts to cut costs and demonstrate effectiveness.

“Now is the time to do better with less,” Sall said, outlining his vision for a more efficient and forward-looking institution.The candidates are vying for a five-year term, renewable once, in a process that has drawn fewer applicants compared to 2016, when Guterres was selected from a field of 13 contenders.

Grynspan and Michelle Bachelet are seeking to become the first woman to lead the United Nations, reflecting a broader push for gender representation at the highest levels of global governance.

Bachelet reiterated her support for women’s rights during her hearing, amid opposition from some conservative U.S. lawmakers over her stance on abortion.Also in the race is Rafael Grossi, a career diplomat from Argentina who currently heads the International Atomic Energy Agency.

Grossi said reform efforts were progressing but remained incomplete.While there is no formal requirement, longstanding precedent discourages candidates from the five permanent members of the United Nations Security Council Britain, China, France, Russia and the United States to avoid concentration of power, although their support remains decisive in the selection process.

Coyle, currently chief of joint capabilities, will replace Lieutenant General Simon Stuart, the government said. Her appointment comes as the Australian Defence Force seeks to increase female representation and address allegations of systemic sexual harassment and discrimination.

Defence Minister Richard Marles described the move as a “deeply historic moment,” adding that Coyle’s leadership would be significant for women serving in the military and those considering enlistment.Coyle, 55, joined the army in 1987 and has held several senior command roles.

Marles said she would also become the first woman to lead any service branch within the ADF.Women currently account for about 21% of ADF personnel and 18.5% of senior leadership positions. The military has set a target of raising female participation to 25% by 2030.

The leadership changes come after a class action lawsuit filed in October alleged the ADF failed to protect thousands of female personnel from sexual assault, harassment and discrimination.

In parallel appointments, Vice Admiral Mark Hammond will become chief of the ADF, replacing Admiral David Johnston, while Rear Admiral Matthew Buckley will take over as head of the navy.