The invention relates to a capsule (1) for food or beverage preparation comprising a hollow body (2) and an injection wall (4) to be punctured for fluid injection into the capsule, a chamber (10) formed inside the body containing an ingredient, a membrane (9) disposed at a bottom end of the chamber, and opening means (15) disposed outside the chamber (10) in the vicinity of the membrane (9). The opening means (15) are configured to open the membrane (9) when said membrane (9) is pressed against said opening means (15) under an opening pressure. The membrane is attached to the body (2) of the capsule by an adhesive seal (11) which provides sealing between the body (2) and the membrane (9). When a release pressure is established inside the chamber (10), the adhesive seal bead (11) allows the membrane (9) to be displaced relatively to the body (2) and to engage against the opening means (15) while it maintains an attachment between the membrane and the capsule body (2).