diff --git a/requirements.txt b/requirements.txt
index 8a4b23bc..8a824ffd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,6 +4,7 @@ codecov
 pytest-httpbin==0.0.7
 pytest-mock
 pytest-cov
+pytest-xdist
 alabaster
 readme_renderer
 Sphinx<=1.5.5