diff --git a/requirements/py27-tests.txt b/requirements/py27-tests.txt
index 81fedb9..a13d000 100644
--- a/requirements/py27-tests.txt
+++ b/requirements/py27-tests.txt
@@ -3,4 +3,4 @@ mozlog==3.4
 pytest==3.0.7
 pytest-metadata==1.3.0
 pytest-selenium==1.9.1
-pytest-xdist==1.15.0
+pytest-xdist==1.16.0
diff --git a/requirements/py36-tests.txt b/requirements/py36-tests.txt
index 4a7dd64..f6d5493 100644
--- a/requirements/py36-tests.txt
+++ b/requirements/py36-tests.txt
@@ -2,4 +2,4 @@ mock==2.0.0
 pytest==3.0.7
 pytest-metadata==1.3.0
 pytest-selenium==1.9.1
-pytest-xdist==1.15.0
+pytest-xdist==1.16.0