Parabola, Firestone Walker’s extremely popular 14 percent ABV Russian imperial stout, will be available again in bottles on March 21.

Originally released in 2009, the newest incarnation is brewed with Zeus and hallertau hops along with nine different malts before being aged in bourbon barrels.

Firestone Walker Parabola

According to a post on Firestone Walker’s website, Parabola will be packaged in 22-ounce bottles and will be released on March 21 during an event at the brewery. Bottles will then begin to show up on retailer’s shelves “within a week or two after our release.”

Parabola is part of the Proprietor’s Vintage Series.