diff --git a/requirements.txt b/requirements.txt
index 167a86c..677b2cd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ Jinja2==2.11.1
 MarkupSafe==1.1.1
 mysql-connector-python==8.0.19
 pep8==1.7.1
-protobuf==3.6.1
+protobuf==3.18.3
 pycodestyle==2.5.0
 pycparser==2.20
 pyOpenSSL==19.1.0