diff --git a/backend/services/search_v2/hybrid_searcher.py b/backend/services/search_v2/hybrid_searcher.py
index 01abf9d..db80363 100644
--- a/backend/services/search_v2/hybrid_searcher.py
+++ b/backend/services/search_v2/hybrid_searcher.py
@@ -28,7 +28,7 @@ def __init__(
         pinecone_index,
         embedding_fn,
         cohere_api_key: Optional[str] = None,
-        rerank_model: str = "rerank-v3.5",
+        rerank_model: str = "rerank-v4.0-fast",
     ):
         self.index = pinecone_index
         self.embed = embedding_fn