diff --git a/requirements_dev.txt b/requirements_dev.txt
index a5bd712..b2c89de 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -17,7 +17,7 @@ MarkupSafe==1.0
 mccabe==0.6.1
 pathtools==0.1.2
 pluggy==0.4.0
-py==1.4.34
+py==1.10.0
 pyasn1==0.3.1
 pycodestyle==2.3.1
 pycparser==2.18