diff --git a/geomagio/algorithm/MetadataAlgorithm.py b/geomagio/algorithm/MetadataAlgorithm.py
index 5fc87c68e0ac2805bcdef345cdde0cf4e5525ba7..027e753d02fbc83b578443872a8c44fbfb474a0f 100644
--- a/geomagio/algorithm/MetadataAlgorithm.py
+++ b/geomagio/algorithm/MetadataAlgorithm.py
@@ -72,7 +72,7 @@ class MetadataAlgorithm(BaseModel):
             created_by=created_by,
             starttime=starttime,
             endtime=endtime,
-            metadata=metadata_class(**metadata_dict),
+            metadata=(metadata_class(**metadata_dict)).model_dump(),
             network=network,
             channel=channel,
             location=location,