diff --git a/test-requirements.txt b/test-requirements.txt
index a8d9df17ea..48b3294afa 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -9,10 +9,12 @@ openstacksdk
 zuul-sphinx>=0.2.3
 testtools
 mock
+# pytest 6.0.0 breaks pytest-html
+pytest<6.0.0
+pytest-html # MPL-2.0
 # testinfra 1.17.0 has a broken wheel that won't install under python3
 # testinfra 3.0.0 switched the ansible backend, but broke ipv6 handling
 testinfra!=1.17.0,!=3.0.0
-pytest-html # MPL-2.0
 # testinfra's ansible backend actually requires paramiko, but it's not
 # specified.  After
 #  https://github.com/philpep/testinfra/pull/454