diff --git a/requirements.txt b/requirements.txt
index 8971d5f..62fbf09 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,4 @@ coolname>=1.1.0
 tabulate>=0.8.3
 tensorboardX>=1.4
 
+protobuf>=4.25.8 # not directly required, pinned by Snyk to avoid a vulnerability