diff --git a/requirements-dev.txt b/requirements-dev.txt
index 4afab8f..bd8695b 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -2,7 +2,7 @@ flake8==3.3.0
 mccabe==0.6.1
 pycodestyle==2.3.1
 pyflakes==1.5.0
-py==1.4.34
+py==1.5.1
 pytest==3.1.2