A needle changing device for use on a medication delivery device includes an engagement element that is configured to engage the medication delivery device and pierce a septum of the medication delivery device, a needle holder connected to the engagement element, the needle holder having a needle changing septum having a reservoir, the reservoir being in continuous fluid communication with the engagement element, and a plurality of needles configured to pierce the needle changing septum, wherein when the needle holder is in a first position, the plurality of needles are disengaged from the reservoir of the needle changing septum, and when the needle holder is in a second position, one of the plurality of needles enters into fluid communication with the reservoir of the needle changing septum and is partially exposed outside the needle changing device for medicament delivery.