diff --git a/requirements.txt b/requirements.txt
index 9230db5..baba278 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ Keras-Applications==1.0.8
 Keras-Preprocessing==1.1.0
 Markdown==3.1.1
 numpy==1.16.4
-protobuf==3.8.0
+protobuf==3.18.3
 python-dateutil==2.8.0
 requests==2.22.0
 s3transfer==0.2.1