diff --git a/requirements_py2.txt b/requirements_py2.txt
index 51170a450..4fb058918 100644
--- a/requirements_py2.txt
+++ b/requirements_py2.txt
@@ -29,7 +29,7 @@ python-dateutil==2.5.0
 python-mimeparse==1.5.1
 pytz==2014.10
 simplejson==3.6.5
-six==1.9.0
+six>=1.9.0
 speaklater==1.3
 SQLAlchemy==1.0.14
 testscenarios==0.5.0
diff --git a/requirements_py3.txt b/requirements_py3.txt
index f68db7a84..c4490f527 100644
--- a/requirements_py3.txt
+++ b/requirements_py3.txt
@@ -28,7 +28,7 @@ python-dateutil==2.5.0
 python-mimeparse==1.5.1
 pytz==2014.10
 simplejson==3.6.5
-six==1.9.0
+six>=1.9.0
 speaklater==1.3
 SQLAlchemy==1.0.14
 testscenarios==0.5.0