diff --git a/requirements.txt b/requirements.txt
index b3c7ba24..32bda249 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
 grpcio>=1.2.0
 tenacity==5.0.2
-protobuf==3.6.1
\ No newline at end of file
+protobuf==3.9.1
\ No newline at end of file