Upslope Brewing Co.’s next Lee Hill Series release was inspired by traditional monastic brewing.

The Boulder, Colo.-based brewery will be releasing Belgian Style Quadrupel Ale, a 12.8 percent ABV quadrupel brewed with “a select strain” of Belgian yeast and traditional Belgian candi syrup. The beer was then aged for over six months in order to “mellow and soften its character.”

“This fifth installment falls near the first anniversary of releasing our Lee Hill Series,” said Sam Scruby, Upslope head brewer, in a post on the brewery’s Facebook page. “The Lee Hill brewing facility is where we revel in and explore small batch experimentation and creativity. One year in to the Series, we couldn’t be more pleased with the creations that have come out of this place. It’s a great time to reinforce our commitment to experimenting and crafting small batch, innovative styles and carry on this quarterly tradition.”

Belgian Style Quadrupel Ale is part of Upslope’s Lee Hill Series, which commemorates the original brewery location at Lee Hill in Boulder, Colo. which is now used to produce small batch releases. To date, there have been four other releases in the Lee Hill Series: Vol. 1: Barrel Aged Brown Ale, a 7.6 percent ABV brown ale also aged for four months in Leopold Bros. rye whiskey barrels; Vol. 2: Wild Saison, a 6.8 percent ABV saison that was aged for seven months in red wine barrels and was brewed with both lactobacillus and brettanomyces; Vol: 3: Barrel Aged Imperial Stout, a 10 percent ABV imperial stout aged in Leopold Bros. Maryland-style rye whiskey barrels for four months and Vol. 4: Manhattan Style Rye Ale, a 10.4 percent ABV ale that has been aged in first use Leopold Bros. Maryland-style rye whiskey barrels.

According to the brewery, 19.2 ounce cans ($13) of Lee Hill Series: Vol. 5 will be released at an event on Aug. 13 at the Lee Hill tap room in Boulder, Colo. with a four can per person limit.