diff --git a/requirements.txt b/requirements.txt
index f4862419..68a298c2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,6 +16,6 @@ pyjwt>=1.6.4,<2.0.0 ; python_version <= '3.5'
 PyYAML>=3.12
 referencing<0.40 ; python_version >= '3.8'
 requests>=2.20.0
-six>=1.13.0
+six>=1.16.0
 typing>=3.6.4 ; python_version < '3.5'
 urllib3>=1.21.1