Kenya’s Supreme Court on Monday unanimously rejected challenges to the official results of the presidential election and upheld Deputy President William Ruto’s narrow win in East Africa’s most stable democracy.

Ruto is expected to be sworn in on Sept. 13. Opposition candidate Raila Odinga had alleged irregularities in the otherwise peaceful Aug. 9 election that was marked by last-minute drama when the electoral commission split and traded accusations of misconduct.

The court found little or no evidence for the various allegations and called some “nothing more than hot air.” It also expressed puzzlement why the four dissenting commissioners participated until the final minutes in a vote-tallying process they criticized as opaque.

The commission “needs far-reaching reforms,” the court acknowledged, “but are we to nullify an election on the basis of a last-minute boardroom rupture?”

The Supreme Court shocked Kenyans in the previous election in 2017 by overturning the results of the presidential election, a first in Africa, and ordered a new vote after Odinga filed a challenge. He then boycotted that new election.

This time, Odinga was backed by former rival and outgoing President Uhuru Kenyatta in the latest example of shifting political alliances. Odinga’s team had challenged the technology used by the electoral commission and alleged that voting results had been tampered with, and it argued that the electoral commission chair had essentially acted alone in declaring the winner.

The election had been seen as the country’s most transparent, with results from tens of thousands of polling stations posted online within hours of the vote for Kenyans to follow the tally themselves. Such reforms were in part the result of Odinga’s previous election challenge.