diff --git a/requirements.txt b/requirements.txt
index f02e198..a3423ef 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ idna-ssl==1.1.0
   idna==2.9
 mysql-connector-python==8.0.19
   dnspython==1.16.0
-  protobuf==3.6.1
+  protobuf==3.18.3
     setuptools==46.3.0
     six==1.14.0
 pef==1.1.0