diff --git a/var/spack/repos/builtin/packages/py-six/package.py b/var/spack/repos/builtin/packages/py-six/package.py
index 05c5bd00a9..df277100f7 100644
--- a/var/spack/repos/builtin/packages/py-six/package.py
+++ b/var/spack/repos/builtin/packages/py-six/package.py
@@ -6,6 +6,7 @@ class PySix(Package):
     url      = "https://pypi.python.org/packages/source/s/six/six-1.9.0.tar.gz"
 
     version('1.9.0', '476881ef4012262dfc8adc645ee786c4')
+    version('1.10.0', '34eed507548117b2ab523ab14b2f8b55')
 
     extends('python')
     depends_on('py-setuptools')