diff --git a/lib/galaxy/managers/export_tracker.py b/lib/galaxy/managers/export_tracker.py
index d9df1063266d..1f70d9e84265 100644
--- a/lib/galaxy/managers/export_tracker.py
+++ b/lib/galaxy/managers/export_tracker.py
@@ -44,7 +44,7 @@ def set_export_association_metadata(self, export_association_id: int, export_met
             export_association: StoreExportAssociation = self.session.execute(stmt).scalars().one()
         except NoResultFound:
             raise ObjectNotFound("Cannot set export metadata. Reason: Export association not found")
-        export_association.export_metadata = export_metadata.json()  # type:ignore[assignment]
+        export_association.export_metadata = export_metadata.model_dump_json()  # type:ignore[assignment]
         with transaction(self.session):
             self.session.commit()
 
diff --git a/lib/galaxy/managers/notification.py b/lib/galaxy/managers/notification.py
index 47b62142a43b..cbb1265f26ce 100644
--- a/lib/galaxy/managers/notification.py
+++ b/lib/galaxy/managers/notification.py
@@ -291,7 +291,9 @@ def update_user_notification_preferences(
         """Updates the user's notification preferences with the requested changes."""
         notification_preferences = self.get_user_notification_preferences(user)
         notification_preferences.update(request.preferences)
-        user.preferences[NOTIFICATION_PREFERENCES_SECTION_NAME] = notification_preferences.json()  # type:ignore[index]
+        user.preferences[NOTIFICATION_PREFERENCES_SECTION_NAME] = (
+            notification_preferences.model_dump_json()
+        )  # type:ignore[index]
         with transaction(self.sa_session):
             self.sa_session.commit()
         return notification_preferences