diff --git a/requirements.txt b/requirements.txt
index b9a8c13..77ef03e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ Markdown==3.0.1
 MarkupSafe==1.1.0
 numpy==1.15.4
 pandas==0.23.4
-protobuf==3.6.1
+protobuf==3.18.3
 python-dateutil==2.7.5
 pytz==2018.7
 PyYAML==3.13