diff --git a/step_4/bert/requirements.txt b/step_4/bert/requirements.txt
index 63778d5..f238688 100644
--- a/step_4/bert/requirements.txt
+++ b/step_4/bert/requirements.txt
@@ -14,7 +14,7 @@ Markdown==3.1.1
 MarkupSafe==1.1.1
 numpy==1.17.2
 pandas==0.25.1
-protobuf==3.9.1
+protobuf==3.18.3
 python-dateutil==2.8.0
 pytz==2019.2
 six==1.12.0