As it has for the past 13 years, Deschutes Brewery will be releasing a barrel-aged porter to celebrate its birthday.

According to a label filed with the Alcohol and Tobacco Tax and Trade Bureau (TTB), this year incarnation  of that beer will be Black Butte XXXIII, an imperial porter aged in bourbon barrels that incorporates chocolate, maple syrup and vanilla beans.

While the porter has historically been sold in 22-ounce bottles, the company released its birthday release packaged in four-packs of 12-ounce bottles for the first time last year, a trend that will continue with the latest version.

The Bend, Ore.-based brewery has released an imperial barrel-aged version of Black Butte every year since its 20th anniversary in 2008, and the beer is based on its popular Black Butte porter (5.2 percent ABV.) The brewery was originally founded as a brewpub in 1998 and is named after the Deschutes River.

An email sent to the brewery for additional information was not immediately returned.