diff --git a/requirements.txt b/requirements.txt
index b3f3f69..b6423ce 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -106,7 +106,7 @@ rsa==4.6
     # via
     #   google-auth
     #   oauth2client
-six==1.15.0
+six==1.16.0
     # via
     #   cryptography
     #   google-api-core