The invention concerns a method of degasification of a carbonated beverage-filled container in an apparatus for blowing and filling containers, the apparatus comprising: —a mold (12) enclosing a blown and carbonated beverage-filled container (14) that comprises a dispensing opening (16), —an injection head (24) that is movable along a longitudinal axis (A) passing by the dispensing opening of the container between a sealing position in which the injection head is in a sealing engagement with the dispensing opening and a non-sealing position in which the injection head is at a distance from the dispensing opening, characterized in that the method comprises the following steps: i) moving the injection head (24) away from the sealing position (3A) to a non-sealing position (3B). ii) moving back the injection head to the sealing position (30), iii) moving the injection head away from the Position sealing position to a non-sealing position (3D).