diff --git a/tox/requirements.txt b/tox/requirements.txt
index 65814b5..66e8207 100644
--- a/tox/requirements.txt
+++ b/tox/requirements.txt
@@ -2,7 +2,7 @@ atomicwrites==1.2.1
 attrs==18.2.0
 more-itertools==4.3.0
 pluggy==0.7.1
-py==1.6.0
+py==1.10.0
 pytest==3.8.0
 six==1.11.0
 tox==3.2.1