diff --git a/requirements.txt b/requirements.txt
index e3ae4e7..0a5d160 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,4 @@ google-auth-oauthlib
 google-auth-httplib2
 requests
 colored
+protobuf>=6.33.5 # not directly required, pinned by Snyk to avoid a vulnerability