diff --git a/requirements.txt b/requirements.txt
index f81a426..645816f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ grpcio==1.21.1
 Markdown==3.1.1
 numpy==1.16.4
 Pillow==8.3.2
-protobuf==3.8.0
+protobuf==3.15.0
 six==1.12.0
 tb-nightly==1.14.0a20190604
 torch==1.2.0