diff --git a/rag/advanced_rag/knowlege_compile/raptor.py b/rag/advanced_rag/knowlege_compile/raptor.py
index e57905bda5..88ead6070d 100644
--- a/rag/advanced_rag/knowlege_compile/raptor.py
+++ b/rag/advanced_rag/knowlege_compile/raptor.py
@@ -317,7 +317,7 @@ class RecursiveAbstractiveProcessing4TreeOrganizedRetrieval:
             return 0, []
 
         # Degrade too much ??
-        n_neighbors = int((len(embeddings) - 1) ** 0.8)
+        n_neighbors = min(int((len(embeddings) - 1) ** 0.8), 100)
         import umap
 
         reduced_embeddings = umap.UMAP(