diff -uNr a/setup.py b/setup.py
--- a/setup.py	2018-07-13 00:15:27.000000000 +0200
+++ b/setup.py	2019-05-03 11:50:56.913761291 +0200
@@ -25,6 +25,18 @@
 # --------------------------------------------------------------------------
 
 from setuptools import setup, find_packages
+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')
+    requirements.append('typing')
+
 
 setup(
     name='msrest',
@@ -46,14 +58,5 @@
         'Programming Language :: Python :: 3.6',
         'License :: OSI Approved :: MIT License',
         'Topic :: Software Development'],
-    install_requires=[
-        "requests~=2.16",
-        "requests_oauthlib>=0.5.0",
-        "isodate>=0.6.0",
-        "certifi>=2017.4.17",
-    ],
-    extras_require={
-        ":python_version<'3.4'": ['enum34>=1.0.4'],
-        ":python_version<'3.5'": ['typing'],
-    }
+    install_requires=requirements
 )