Nearly three years later in November of 2005, a pair of friends, Gert Christiaens & Roland De Bus reopened the brewery and restarted wort production at Boon. Though reopened only as a side project, Oud Beersel continued to grow and Roland De Bus resigned in 2007 leaving the company to Gert Christiaens. Today, Oud Beersel lambic is still brewed at Boon based on specifications from older recipes of the Vandervelden family and then immediately transported to Oud Beersel for barreling. Though the wort is still brewed at Boon, Oud Beersel is blended in-house without the addition of other brewery’s lambic. Today Oud Beersel’s production is up to nearly 1,050 hectoliters, half of which which includes two non-lambic beers.<ref name=GeuzeKriek /> Oud Beersel became a member of [[HORAL|HORAL]] on January 18, 2006.<ref name=OudBeerselHistory> Oud Beersel History (Dutch), http://www.oudbeersel.com/brouwerij/historie/</ref><ref name=HoralOudBeersel>HORAL, Oud Beersel (Dutch), http://www.horal.be/leden/oud-beersel-beersel</ref> On May 25, 2006 , exactly six months after the official reopening of the brewery, Oud Beersel released a limited test batch of Oude Geuze and Oude Kriek which paved the way for the 2007 bottling of Oude Geuze to be voted the world’s best geuze by the magazine “Beers of the World."<ref name=OudBeerselHistory> Oud Beersel History (Dutch), http://www.oudbeersel.com/brouwerij/historie/</ref>
In 2015 Oud Beersel added additional 60 and 120 hectoliter foudres to the second floor renovated loft of the brewery.In 2017, Oud Beersel acquired 1.71 hectares of farmland behind the brewery, where a new orchard of 320 Schaerbeekse cherry trees was planted. The first harvest from the orchard is expected in 2020.<ref name=EditiePajot>Oud BEERSEL - Aanplanting Kriekerij van Schaarbeekse krieken, Feb. 24, 2017. https://editiepajot.com/regios/3/articles/53084</ref>
===Boon's involvement in Oud Beersel===