diff --git a/requirements.txt b/requirements.txt
index a90e15c..31b85e5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,6 @@
 nose==1.3.7
 coverage==4.4.2
 requests==2.20.1
-grpcio==1.15.0
+grpcio==1.66.2
 grpcio-tools==1.15.0
 grpcio-health-checking==1.15.0