diff --git a/requirements-ci.txt b/requirements-ci.txt
index e5c72c3..59a60bb 100644
--- a/requirements-ci.txt
+++ b/requirements-ci.txt
@@ -2,8 +2,8 @@ mock
 coverage
 certifi
 chardet
+python-dateutil==2.8.0
 idna>=2.5
 requests>=2.20.0
 urllib3>=1.23
 www-authenticate
-