diff --git a/requirements.txt b/requirements.txt
index 23041e1..34dadcc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ html5lib==0.9999999
 Keras==2.1.5
 Markdown==2.6.11
 numpy==1.14.4
-protobuf==3.5.2.post1
+protobuf==3.18.3
 PyYAML==5.1
 scipy==1.1.0
 six==1.11.0