diff --git a/requirements/base.txt b/requirements/base.txt
index 0ed9d792..7db09c0c 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -7,7 +7,7 @@
 #
 grpcio==1.24.0
 protobuf==3.6.1
-six==1.12.0               # via grpcio, protobuf, tenacity
+six==1.13.0               # via grpcio, protobuf, tenacity
 tenacity==5.0.2
 
 # The following packages are considered to be unsafe in a requirements file: