diff --git a/requirements.txt b/requirements.txt
index 82b480c..3c34b45 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,6 +8,7 @@ Jinja2>=2.0.0,<3.0.0
 cryptography>=2.0.0,<3.0.0
 python-dateutil>=2.0.0,<3.0.0
 SQLAlchemy>=1.0.0,<2.0.0
+python-dateutil>=2.0.0,<3.0.0
 pytest>=5.0.0,<6.0.0
 pylint>=2.0.0,<3.0.0
 rope>=0.0.0,<1.0.0