diff --git a/requirements_dev.txt b/requirements_dev.txt
index 562dd235..7aa98aea 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,4 +1,3 @@
-py==1.4.22
 pytest==2.6.0
 pytest-cov==1.7.0
 sphinx