diff --git a/setup.py b/setup.py
index 33fe153d..0cd1a4be 100644
--- a/setup.py
+++ b/setup.py
@@ -2,9 +2,14 @@
 import sys
 from setuptools import setup
 
-INSTALL_REQUIRES = ['requests >=1.0.3', 'boto >=2.45.0', 'six >=1.2.0', 'urllib3 >= 1.0.2', 'inflection >= 0.3.1']
+INSTALL_REQUIRES = ['requests >=1.0.3', 'boto >=2.45.0', 'six >=1.2.0', 'urllib3 >= 1.0.2']
+
 if sys.version_info < (2, 7, 0):
     INSTALL_REQUIRES.append('argparse>=1.1')
+if sys.version_info < (3, 5):
+    INSTALL_REQUIRES.append('inflection==0.3.1')
+else:
+    INSTALL_REQUIRES.append('inflection>=0.3.1')
 
 
 def read(fname):