diff --git a/test/units/requirements.txt b/test/units/requirements.txt
index fb7291545de..fa461030387 100644
--- a/test/units/requirements.txt
+++ b/test/units/requirements.txt
@@ -2,3 +2,4 @@ bcrypt ; python_version >= '3.11'  # controller only
 passlib ; python_version >= '3.11'  # controller only
 pexpect ; python_version >= '3.11'  # controller only
 pywinrm ; python_version >= '3.11'  # controller only
+typing_extensions; python_version < '3.11'  # some unit tests need Annotated and get_type_hints(include_extras=True)