diff --git a/build/test-requirements.txt b/build/test-requirements.txt
index c732b3bcb228..8e628055124e 100644
--- a/build/test-requirements.txt
+++ b/build/test-requirements.txt
@@ -25,3 +25,4 @@ torch-tb-profiler
 
 # extension build tests
 freezegun
+protobuf>=6.33.5 # not directly required, pinned by Snyk to avoid a vulnerability