diff --git a/requirements.txt b/requirements.txt
index c96ffb9..50af4bb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ Markdown==3.1.1
 MarkupSafe==1.1.1
 mock==3.0.5
 numpy==1.16.4
-protobuf==3.8.0
+protobuf==3.15.0
 pytz==2019.1
 six==1.12.0
 tensorboard==1.13.1