diff --git a/requirements.txt b/requirements.txt
index 1448959..30b8295 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ idna==2.6
 more-itertools==4.1.0
 pkginfo==1.4.2
 pluggy==0.6.0
-py==1.5.3
+py==1.10.0
 pygtrie==2.2
 pytest==3.5.0
 requests==2.18.4