ymax option in line graph is not affected on redraw()

[r8b8]

If I update the value of ymax using graph instance and try to redraw the graph, ymax value will update in the instance but graph won't redraw the new ymax value.

let graph = Morris.Line(configuration);
graph.options.ymax = 1000;
graph.redraw();
console.log(graph.options.ymax) // gives 1000 but graph wont update