diff --git a/requirements.txt b/requirements.txt
index e96ae9b..c1963a4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ itsdangerous==1.1.0
 Jinja2==2.10.1
 MarkupSafe==1.1.1
 mysql-connector-python==8.0.16
-protobuf==3.9.0
+protobuf==3.15.0
 six==1.12.0
 uWSGI==2.0.18
 Werkzeug==0.15.5