diff -up ./setup.py.orig ./setup.py
--- ./setup.py.orig	2017-06-21 21:09:56.000000000 +0200
+++ ./setup.py	2017-06-30 14:09:35.185100223 +0200
@@ -25,6 +25,17 @@
 # --------------------------------------------------------------------------
 
 from setuptools import setup
+import sys
+
+requirements = [
+    "requests",
+    "requests_oauthlib>=0.5.0",
+    "isodate>=0.5.4",
+    "certifi"
+]
+if sys.version_info[0] == 2:
+    requirements.append('enum34>=1.0.4')
+
 
 setup(
     name='msrest',
@@ -47,13 +58,5 @@ setup(
         'Programming Language :: Python :: 3.6',
         'License :: OSI Approved :: MIT License',
         'Topic :: Software Development'],
-    install_requires=[
-        "requests~=2.14",
-        "requests_oauthlib>=0.5.0",
-        "isodate>=0.5.4",
-        "certifi>=2017.4.17",
-    ],
-    extras_require={
-        ":python_version<'3.4'": ['enum34>=1.0.4'],
-    }
+    install_requires=requirements
 )