如何更新这个Bokeh ColumnDataSource？

from bokeh.models import ColumnDataSource

source = ColumnDataSource()

data = {'x': [1, 2, 3, 4, 5], 'y': [6, 7, 8, 9, 10]}
source.data = data

new_data = {'x': [2, 4, 6, 8, 10], 'y': [12, 14, 16, 18, 20]}
source.data = new_data

from bokeh.plotting import figure, show

p = figure()
p.circle('x', 'y', source=source)
show(p)