diff --git a/requirements.tests.txt b/requirements.tests.txt
index 03fc7a9d..9d96c2ee 100644
--- a/requirements.tests.txt
+++ b/requirements.tests.txt
@@ -1,5 +1,7 @@
 # these are pinned for repeatability, but updated by pyup.io to be latest
 pytest==4.6.9  # pyup: <5.0.0
+more-itertools<8.11.0;python_version<"3.6"
+more-itertools;python_version>="3.6"
 freezegun==0.3.14
 pytest-cov==2.8.1
 pytest-postgresql==1.4.1  # pypup: <2.0