diff --git a/tests/requirements.txt b/tests/requirements.txt
index 982e0903a..12d8abe3a 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -3,9 +3,11 @@
 # pytest>=5 does not support Python 2.7
 pytest<5
 
+# pytest-xdist>=2 does not support Python 2.7
+pytest-xdist<2
+
 pytest-cov
 pytest-timeout
-pytest-xdist
 tox
 
 ## Used by test helpers: