diff --git a/requirements.txt b/requirements.txt
index df7c532..13126bc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-python-dateutil>=2.7
+python-dateutil>=2.9.0.post0
 inflection>=0.3
 unidecode>=1.0
 Jinja2>=2.10