ACF: Update repeater field sort order jquery/ajax

gistfile1.txt

	$('#my-library').sortable({
		// containment: "parent",
		items: "> li.set-item",
		update: function(e, ui){
			console.log('UPDATE');
			var new_order = $(this).sortable('toArray');
			updateSortOrder(new_order);
		}
	});

	function updateSortOrder(new_order) {

		console.log("Updating sort order...");
		var postdata = {
				action: 'library_set_update_sort',
				new_order: new_order
			};

		jQuery.ajax({
			type: "POST",
			url: "/wp-admin/admin-ajax.php",
			dataType: 'json',
			data: postdata,
			success: function(data){
				console.log(data);
			},
			error: function(data){
				console.log("ERROR");
				console.log(data);
			}
		});

	}