diff --git a/requirements.txt b/requirements.txt
index 908d00c..1eaa32f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,7 +30,7 @@ nbformat==4.4.0
 numpy==1.14.2
 pandas==0.22.0
 plotly==2.5.1
-protobuf==3.5.2.post1
+protobuf==3.18.3
 pyparsing==2.2.0
 python-dateutil==2.7.2
 pytz==2018.4