diff --git a/tools/tests-requirements.txt b/tools/tests-requirements.txt
index c099b781e..53601160b 100644
--- a/tools/tests-requirements.txt
+++ b/tools/tests-requirements.txt
@@ -6,7 +6,8 @@ pytest-cov
 # Prevent installing 7.0 which has install_requires "pytest >= 3.10".
 pytest-rerunfailures<7.0
 pytest-timeout
-pytest-xdist
+# Prevent installing 1.28.0 which has install_requires "pytest >= 4.4.0".
+pytest-xdist<1.28.0
 pyyaml
 setuptools>=39.2.0  # Needed for `setuptools.wheel.Wheel` support.
 scripttest