Another year in business for Heavy Seas Beer means another beer to commemorate the occasion.

According to a press release, the Baltimore, Md.-based brewery will be releasing 21 Anniversary Ale, a 10.5 percent imperial extra special bitter brewed with imported malts from the UK as well as chinook, Kent Goldings, and UK fuggle hops along with Domino brown sugar before being aged in Sagamore Spirit rye whiskey barrels for 60 days. As the name suggests, the new beer will be commemorating Heavy Seas’ twenty-first anniversary, which the brewery celebrates on Dec. 8 every year.

Heavy Seas 21 Anniversary Ale 22-Ounce Bottle Label 2

In Dec. 2015, Heavy Seas released 20 Year Storm to celebrate its twentieth anniversary, a 10 percent ABV imperial extra special bitter brewed with warrior, UK goldings, UK fuggles, cascade and centennial hops as well as local Domino brown sugar before being aged in bourbon barrels for “approximately 75 days.”

In addition, a portion of the proceeds from sales of the new beer will support the Clean Water Fund’s efforts to clean up water sources, reduce pollution in the environment, and support local and national policies that regulate natural resources.

Heavy Seas 21 will be packaged in 22-ounce bottles and is scheduled to be released in early December.

Update (Sept. 21, 2016) — This post was updated to include details on the release date and brewing information. It was originally published on Sept. 1, 2016.