diff --git a/requirements.txt b/requirements.txt
index e63d486..fb3978b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ Keras-Applications==1.0.8
 Keras-Preprocessing==1.1.0
 Markdown==3.1.1
 numpy==1.16.4
-protobuf==3.9.1
+protobuf==3.15.0
 six==1.12.0
 tensorboard==1.14.0
 tensorflow==1.14.0