diff --git a/build/test-requirements.txt b/build/test-requirements.txt
index e2248888e5d1..0489ac5c5c67 100644
--- a/build/test-requirements.txt
+++ b/build/test-requirements.txt
@@ -11,6 +11,7 @@ prospector
 pydocstyle
 nose
 pytest==4.6.9 # Last version of pytest with Python 2.7 support
+py==1.8.1
 rope
 flask
 django