diff --git a/requirements.txt b/requirements.txt
index cd68815..1922df3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -28,7 +28,7 @@ Jinja2==2.10
 lazy-object-proxy==1.3.1
 MarkupSafe==1.0
 mccabe==0.6.1
-protobuf==3.6.1
+protobuf==3.18.3
 pycodestyle==2.5.0
 pycparser==2.18
 pylint==1.9.4