Representative implementations of devices and techniques provide a holster lock assembly, which may be used with a carrier or a holster for an implement in a variety of configurations. The holster lock is arranged to be attached to the holster for temporarily and safely locking the implement within the holster, while making the implement easily accessible to the user. The holster lock includes an actuator arm and a locking post. The locking post is arranged to capture a portion of the implement or release the portion of the implement, based on a position of the actuator arm.