diff --git a/requirements.txt b/requirements.txt
index e6fa5c8d3..b04512181 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ requests==2.9.1
 requests_futures==0.9.7
 seccure==0.3.1.3
 simplejson==3.8.2
-six==1.9.0
+six>=1.9.0
 slowaes==0.1a1
 txJSON-RPC==0.3.1
 wsgiref==0.1.2
diff --git a/setup.py b/setup.py
index 1860ae04b..f065cebd7 100644
--- a/setup.py
+++ b/setup.py
@@ -54,7 +54,7 @@ requires = [
     'requests_futures==0.9.7',
     'seccure==0.3.1.3',
     'simplejson==3.8.2',
-    'six==1.9.0',
+    'six>=1.9.0',
     'slowaes==0.1a1',
     'txJSON-RPC==0.3.1',
     'wsgiref==0.1.2',