diff --git a/requirements.txt b/requirements.txt
index 3a6aae5..6346e93 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 Cython==0.29.11
 grpcio==1.21.1
 grpcio-tools==1.21.1
-protobuf==3.8.0
+protobuf==3.15.0
 six==1.12.0