Netflix 's live stream on Saturday revealed that the fourth season of the anime Aggretsuko will premiere in December .
The event also revealed an image for the new season, check it out:

Director Rareko will return to direct the anime, the studio is Fanworks , and the anime's voice actors are also returning.
Synopsis
Retsuko is a 25-year-old red panda who works in the accounting department of her dream company. But it turns out she's forced to keep doing increasingly impossible tasks by her superiors and coworkers.
The first anime featuring the character Aggretsuko (which preceded the Netflix anime) premiered in April 2016 Ou-sama no Brunch program , and aired weekly with new one-minute episodes until March 2018 .
The 10-episode season April 2018 .
The Netflix anime had a Christmas episode that premiered in December 2018, followed by the second season in June 2019. The third season premiered on Netflix in August 2020 .
Source: ANN

