diff --git a/requirements.txt b/requirements.txt
index 372cf78..e102d3c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ lazy-object-proxy==1.3.1
 mccabe==0.6.1
 mysql-connector-python==8.0.14
 pep8==1.7.1
-protobuf==3.6.1
+protobuf==3.18.3
 pycodestyle==2.4.0
 pylint==2.2.2
 requests==2.21.0