An Artificer's homunculus servant has the following ability:
Might of the Master. The following numbers increase by 1 when your proficiency bonus increases by 1: the homunculus's skill and saving throw bonuses (above) and the bonuses to hit and damage of its attack (below).
One of the the listed skill bonuses is +4 to perception. In addition, the homunculus also starts with a passive perception score of 14, consistent with that perception bonus. Does this passive perception score increase along with the homunculus' perception bonus when the Artificer's proficiency bonus increases? For example, what is the passive perception score for a homunculus controlled by a level 5 artificer (whose proficiency bonus is +3)?