diff --git a/requirements/base.txt b/requirements/base.txt
index c9288b0f..d702a1f2 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -7,7 +7,7 @@
 #
 grpcio==1.28.1            # via -r base.in
 protobuf==3.6.1           # via -r base.in
-six==1.14.0               # via grpcio, protobuf
+six==1.15.0               # via grpcio, protobuf
 
 # The following packages are considered to be unsafe in a requirements file:
 # setuptools