1 files changed, 1 insertions, 0 deletions
diff --git a/tox.ini b/tox.ini
index a7b320b6..44c9914c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,6 +11,7 @@ usedevelop = True
 deps =
     # https://requires.io/github/nedbat/coveragepy/requirements/
     git+https://github.com/nedbat/pytest.git@bug2038#egg=pytest==0.0
+    pytest-xdist==1.15.0
     pip==8.1.2
     mock==2.0.0
     PyContracts==1.7.9