diff --git a/rpc/timeline_service.py b/rpc/timeline_service.py
index 8ddcb79..46965a5 100644
--- a/rpc/timeline_service.py
+++ b/rpc/timeline_service.py
@@ -97,7 +97,7 @@ def merge_previous_timeline(
                     m.collect_rate = req.rate
 
                 if should_update:
-                    tl.memo = php.serialize(m.dict())
+                    tl.memo = php.serialize(m.model_dump())
                     session.add(tl)
                 return