diff --git a/backend/oasst_backend/utils/topic_model_requirments.txt b/backend/oasst_backend/utils/topic_model_requirments.txt
index 4941d144ad..ab065c8e97 100644
--- a/backend/oasst_backend/utils/topic_model_requirments.txt
+++ b/backend/oasst_backend/utils/topic_model_requirments.txt
@@ -2,3 +2,4 @@ pandas
 sentence-transformers
 bertopic
 scipy
+sentencepiece>=0.2.1 # not directly required, pinned by Snyk to avoid a vulnerability