diff --git a/requirements.txt b/requirements.txt
index e22aa10..6891f78 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ funcsigs==1.0.2
 more-itertools==4.2.0
 numpy==1.14.3
 pluggy==0.6.0
-py==1.5.3
+py==1.11.0
 pytest==3.6.0
 pytest-cov==2.5.1
 six==1.11.0