diff --git a/requirements-py3.txt b/requirements-py3.txt
index 001d5bc7..314c73ca 100644
--- a/requirements-py3.txt
+++ b/requirements-py3.txt
@@ -26,3 +26,4 @@ tzlocal>=1.1.2
 Jinja2>=2.7.3
 PyMySQL>=0.6.2,!=0.6.4
 apscheduler>=3.0.1
+python_dateutil>=2.4.0
diff --git a/requirements.txt b/requirements.txt
index 300d4041..6927e238 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,3 +27,4 @@ email>=4.0.2
 Jinja2>=2.7.3
 PyMySQL>=0.6.2,!=0.6.4
 apscheduler>=3.0.1
+python_dateutil>=2.4.0
\ No newline at end of file