diff --git a/flask_prediction_api/requirements.txt b/flask_prediction_api/requirements.txt
index 5322a77..81549d5 100644
--- a/flask_prediction_api/requirements.txt
+++ b/flask_prediction_api/requirements.txt
@@ -23,7 +23,7 @@ MarkupSafe==1.1.1
 matplotlib==3.1.1
 numpy==1.17.2
 pandas==0.23.4
-protobuf==3.9.1
+protobuf==3.18.3
 pyparsing==2.4.2
 python-dateutil==2.8.0
 pytz==2019.2