According to a label filed with the Alcohol and Tobacco Tax and Trade Bureau (TTB), The Bruery will soon be releasing a new vintage of their Tart of Darkness beer.

Tart of Darkness is a traditional American stout that’s been aged in oak barrels along with some wild yeast and bacteria which turn the beer sour. This year’s vintage will clock in at 7.9 percent ABV and will be packaged in 750ml bottles.

An email sent to the brewery seeking more information was not immediately returned.