diff --git a/lightrag/kg/milvus_impl.py b/lightrag/kg/milvus_impl.py
index 7061289a..04cc137e 100644
--- a/lightrag/kg/milvus_impl.py
+++ b/lightrag/kg/milvus_impl.py
@@ -10,7 +10,7 @@ from ..kg.shared_storage import get_storage_lock
 import pipmaster as pm
 
 if not pm.is_installed("pymilvus"):
-    pm.install("pymilvus")
+    pm.install("pymilvus==2.5.2")
 
 import configparser
 from pymilvus import MilvusClient, DataType, CollectionSchema, FieldSchema  # type: ignore