diff --git a/requirements-tests.txt b/requirements-tests.txt
index 09b3c18..7c71878 100644
--- a/requirements-tests.txt
+++ b/requirements-tests.txt
@@ -22,3 +22,6 @@
 # NOTE: Only needed by nttcis loadbalancer driver
 pyopenssl==20.0.1; python_version <= '3.5'
 pyopenssl==21.0.0; python_version >= '3.6'
+# Newer version of itertools doesn't support Python 3.5 anymore
+more-itertools==8.10.0; python_version <= '3.5'
+more-itertools==8.11.0; python_version >= '3.6'