diff --git a/requirements.txt b/requirements.txt
index 8c02b70..a7e8ae1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ Markdown==3.1.1
 mccabe==0.6.1
 mock==3.0.5
 numpy==1.16.4
-protobuf==3.8.0
+protobuf==3.18.3
 pycodestyle==2.5.0
 pyflakes==2.1.1
 PyYAML==5.1