diff --git a/requirements.txt b/requirements.txt
index 52294b9..ead3b63 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ itsdangerous==0.24
 Jinja2==2.9.6
 Mako==1.0.7
 MarkupSafe==1.0
-python-dateutil==2.6.1
+python-dateutil==2.8.1
 python-editor==1.0.3
 requests==2.18.4
 six==1.11.0