A child safety plug lock for releasably securing a plug within a power outlet. The plug lock comprises a body portion including a through-hole and left and right sides. The plug lock also includes left and right arm portions which extend from the left and right sides, respectively, of the body portion. Each arm portion includes an inwardly facing flange. The plug lock is designed to be secured to an outlet via the through-hole in the body portion. The flanges are sized and positioned to engage and retain a plug in the power outlet when the plug lock is attached to the power outlet via the through-hole. The left and right arm portions are flexible, and are sized and positioned such that pressure applied to an arm portion causes that arm portion to flex laterally away from the plug.