diff --git a/requirements.txt b/requirements.txt
index 93b8b1a..0cd08cf 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==1.17.1
-protobuf==3.9.1
+protobuf==3.18.3
 scikit-learn==0.21.3
 scipy==1.3.1
 six==1.12.0