Australia's 2-1 Ashes defeat, confirmed with a heavy 197-run loss at The Oval on Sunday, has cost them their No. 1 spot in the ICC Test rankings.
Australia is now dropped to 4th place and South Africa topping the rankings list for tests.
It is the first time the Australians have lost their grip on the top spot since 2003, when the ICC introduced its current ranking system.
The defeat has cost them eight points but despite the series result they remain ahead of their arch rivals England, who are in fifth place. England gained six points but are still 11 behind Australia.
South Africa now the No. 1 Test team in the world, followed by Sri Lanka at the 2nd place while india reaching the 3rd spot.