diff --git a/requirements.txt b/requirements.txt
index a878513..02a9a81 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ jmespath==0.9.3
 Markdown==2.6.11
 numpy==1.14.5
 pkg-resources==0.0.0
-protobuf==3.6.0
+protobuf==3.18.3
 python-dateutil==2.7.3
 requests==2.19.1
 s3transfer==0.1.13