diff --git a/posthog/warehouse/api/external_data_schema.py b/posthog/warehouse/api/external_data_schema.py
index 9391268bb69d0..9ee1755ee922f 100644
--- a/posthog/warehouse/api/external_data_schema.py
+++ b/posthog/warehouse/api/external_data_schema.py
@@ -147,6 +147,8 @@ def update(self, instance: ExternalDataSchema, validated_data: dict[str, Any]) -
             payload = instance.sync_type_config
             payload.pop("incremental_field", None)
             payload.pop("incremental_field_type", None)
+            payload.pop("incremental_field_last_value", None)
+            payload.pop("incremental_field_last_value_v2", None)
 
             validated_data["sync_type_config"] = payload