It was deprecated in docutils 0.18.1 in favor of nodes.Node.Findall() , and now triggers the following warning message. ``` DeprecationWarning: nodes.Node.traverse() is obsoleted by Node.findall(). ``` The docutils library is added to the dependency list because it is directly imported. [1] https://docutils.sourceforge.io/RELEASE-NOTES.html#release-0-18-1-2021-12-23 Change-Id: Ie988a510897d98b68581ee6dcc927aa9701c77e8 Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>