diff --git a/requirements.txt b/requirements.txt
index dea2411..a222c4d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ grpcio==1.24.3
 Markdown==3.1.1
 numpy==1.17.3
 Pillow==8.2.0
-protobuf==3.10.0
+protobuf==3.18.3
 PyYAML==5.4
 six==1.12.0
 tensorboard==2.0.0