diff -ur botocore-1.5.3.orig/requirements.txt botocore-1.5.3/requirements.txt
--- botocore-1.5.3.orig/requirements.txt	2017-01-20 11:06:07.081344531 +0000
+++ botocore-1.5.3/requirements.txt	2017-01-20 11:06:56.409021742 +0000
@@ -1,5 +1,5 @@
 tox>=2.5.0,<3.0.0
-python-dateutil>=2.1,<3.0.0
+python-dateutil>=1.4,<3.0.0
 nose==1.3.0
 mock==1.3.0
 wheel==0.24.0
diff -ur botocore-1.5.3.orig/setup.cfg botocore-1.5.3/setup.cfg
--- botocore-1.5.3.orig/setup.cfg	2017-01-20 11:06:07.082344504 +0000
+++ botocore-1.5.3/setup.cfg	2017-01-20 11:07:15.994496531 +0000
@@ -3,7 +3,7 @@
 
 [metadata]
 requires-dist =
-	python-dateutil>=2.1,<3.0.0
+	python-dateutil>=1.4,<3.0.0
 	jmespath>=0.7.1,<1.0.0
 	docutils>=0.10
 	ordereddict==1.1; python_version=="2.6"
diff -ur botocore-1.5.3.orig/setup.py botocore-1.5.3/setup.py
--- botocore-1.5.3.orig/setup.py	2017-01-20 11:06:07.078344611 +0000
+++ botocore-1.5.3/setup.py	2017-01-20 11:07:27.367191557 +0000
@@ -6,7 +6,7 @@
 
 
 requires = ['jmespath>=0.7.1,<1.0.0',
-            'python-dateutil>=2.1,<3.0.0',
+            'python-dateutil>=1.4,<3.0.0',
             'docutils>=0.10']