public static function remove_roles() {

		if ( ! class_exists( 'WP_Roles' ) ) {
			return;
		}

		$wp_roles = wp_roles();

		// Delete all our custom roles.
		foreach ( array_keys( self::get_roles() ) as $role ) {
			$wp_roles->remove_role( $role );
		}

		// Remove custom caps from the WP core admin role.
		self::update_caps( $wp_roles->get_role( 'administrator' ), 'remove', array( 'wp' ) );

	}