diff --git a/pydevtools.txt b/pydevtools.txt
index 3f74b44..e2a883b 100644
--- a/pydevtools.txt
+++ b/pydevtools.txt
@@ -6,6 +6,7 @@ flake8
 mypy
 sphinx
 pytest
+pytest-xdist
 coverage
 ipython
 rstcheck
diff --git a/setup.py b/setup.py
index ff5c456..fcdf187 100755
--- a/setup.py
+++ b/setup.py
@@ -22,6 +22,7 @@
         'mypy',
         'pypng',
         'pytest',
+        'pytest-xdist',
     ],
     entry_points={
         'console_scripts': [