diff --git a/requirements.txt b/requirements.txt
index b8a1cc0..3d9794c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,4 +2,4 @@ grpcio==1.30.0
 grpcio-tools==1.31.0
 requests==2.24.0
 prometheus_client==0.8.0
-protobuf==3.12.2
+protobuf==3.15.0