diff --git a/requirements.txt b/requirements.txt
index 432d7cfd01..1a2cac3b9e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+grpcio==1.27.2
 Flask==0.12.4
 Werkzeug==0.11.11
 Jinja2==2.8