diff --git a/requirements/test.txt b/requirements/test.txt
index a54c6a16..8704d9cd 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -27,7 +27,7 @@ flake8-docstrings==1.3.0
 flake8-import-order==0.18.1
 flake8-polyfill==1.0.2    # via flake8-docstrings
 flake8==3.7.8
-grpcio-tools==1.27.2
+grpcio-tools==1.28.1
 hypothesis==4.56.3
 idna==2.8                 # via requests
 imagesize==1.1.0          # via sphinx