diff --git a/requirements_dev.txt b/requirements_dev.txt
index 6054b14..c966d48 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,3 +3,4 @@ wheel==0.38.1
 nose==1.3.7
 mock==2.0.0
 flake8
+pytest