diff --git a/flask_app/requirements.txt b/flask_app/requirements.txt
index 23abd9df..45e443ee 100644
--- a/flask_app/requirements.txt
+++ b/flask_app/requirements.txt
@@ -15,7 +15,7 @@ itsdangerous==1.1.0
 Jinja2==2.11.2
 MarkupSafe==1.1.1
 pkg-resources==0.0.0
-protobuf==3.11.3
+protobuf==3.18.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pytz==2020.1