diff --git a/backend/categorisation/processor.py b/backend/categorisation/processor.py
index 9c1bb8f0..ee42efcd 100644
--- a/backend/categorisation/processor.py
+++ b/backend/categorisation/processor.py
@@ -1,12 +1,9 @@
 from collections import defaultdict
-from typing import List, cast
-
-from sqlalchemy import Tuple
+from typing import List, Tuple, cast
 
 from backend.app.db.functions.recommendations_functions import (
     get_plans_by_portfolio_id,
     get_scenario,
-    set_plan_default,
     update_plan,
 )
 from backend.app.db.models.recommendations import PlanModel, ScenarioModel
@@ -65,7 +62,7 @@ def _update_default_flags(plans: List[Plan], cheapest_plan: Plan) -> None:
         plan.set_default(plan.id == cheapest_plan.id)
 
         plan_model, scenario_model = cast(
-            tuple[PlanModel, ScenarioModel],
+            Tuple[PlanModel, ScenarioModel],
             plan.to_sqlalchemy(),
         )