pip-requirements-tests.txt | 1 +

diff --git a/pip-requirements-tests.txt b/pip-requirements-tests.txt
index 0af8b463a0195daf7a6ac518f6bfd536081386c931598aac10f7596d9aeb1dac..004fd22be8213edfb00fcabdc4474395b4992180442c5a60286989c3c9e2dd2f 100644
--- a/pip-requirements-tests.txt
+++ b/pip-requirements-tests.txt
@@ -2,3 +2,4 @@ attrs==19.3.0
 coverage==4.5.4
 enum34==1.1.6 ; python_version == '2.7'
 hypothesis==3.57.0
+python-dateutil==2.8.1