diff --git a/tests/utils/constraints.txt b/tests/utils/constraints.txt
index 0fcb094a..cc1edab2 100644
--- a/tests/utils/constraints.txt
+++ b/tests/utils/constraints.txt
@@ -9,6 +9,7 @@ urllib3 < 1.24 ; python_version < '2.7' # urllib3 1.24 and later require python
 wheel < 0.30.0 ; python_version < '2.7' # wheel 0.30.0 and later require python 2.7 or later
 paramiko < 2.4.0 ; python_version < '2.7' # paramiko 2.4.0 drops support for python 2.6
 requests < 2.20.0 ; python_version < '2.7' # requests 2.20.0 drops support for python 2.6
+requests < 2.28 ; python_version < '3.7' # requests 2.28.0 drops support for python < 3.7
 virtualenv < 16.0.0 ; python_version < '2.7' # virtualenv 16.0.0 and later require python 2.7 or later
 pyopenssl < 18.0.0 ; python_version < '2.7' # pyOpenSSL 18.0.0 and later require python 2.7 or later
 setuptools < 45 ; python_version <= '2.7' # setuptools 45 and later require python 3.5 or later