diff --git a/requirements/prod.txt b/requirements/prod.txt
index 24ffec328e..93260d4577 100644
--- a/requirements/prod.txt
+++ b/requirements/prod.txt
@@ -1,3 +1,3 @@
 -r common.txt
-python-dateutil==2.6.1
+# Used for running the Zulip production Django server
 uWSGI==2.0.14
diff --git a/requirements/prod_lock.txt b/requirements/prod_lock.txt
index 843456b81d..8037ddd7be 100644
--- a/requirements/prod_lock.txt
+++ b/requirements/prod_lock.txt
@@ -74,7 +74,6 @@ pyjwt==1.5.2
 pyldap==2.4.37
 pylibmc==1.5.2
 pyopenssl==17.2.0         # via ndg-httpsclient
-python-dateutil==2.6.1
 python-gcm==0.4
 python-twitter==3.3
 python3-openid==3.1.0     # via social-auth-core