diff --git a/requirements.txt b/requirements.txt
index aeb2846..1fd3900 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ MarkupSafe==1.1.1
 numpy==1.18.1
 opt-einsum==3.1.0
 pandas==1.0.1
-protobuf==3.15.0
+protobuf==3.18.3
 python-dateutil==2.8.1
 pytz==2019.3
 PyYAML==5.3