diff --git a/pymilvus/orm/collection.py b/pymilvus/orm/collection.py
index 2e2459721..57da6150d 100644
--- a/pymilvus/orm/collection.py
+++ b/pymilvus/orm/collection.py
@@ -1242,6 +1242,7 @@ def drop_partition(self, partition_name: str, timeout: Optional[float] = None, *
             False
         """
         conn = self._get_connection()
+        conn.release_partitions(self._name, [partition_name])
         return conn.drop_partition(self._name, partition_name, timeout=timeout, **kwargs)
 
     @property