diff --git a/requirements.txt b/requirements.txt
index d6f948d..5915438 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ itsdangerous==1.1.0
 Jinja2==2.10.3
 MarkupSafe==1.1.1
 mysql-connector-python==8.0.18
-protobuf==3.11.1
+protobuf==3.15.0
 simplejson==3.17.0
 six==1.13.0
 Werkzeug==0.16.0