diff --git a/src/backtest_engine/backtest_request_intake.py b/src/backtest_engine/backtest_request_intake.py
index 5cc9fa5..fc436df 100644
--- a/src/backtest_engine/backtest_request_intake.py
+++ b/src/backtest_engine/backtest_request_intake.py
@@ -408,7 +408,7 @@ def claim(
                 )
                 return RequestClaim(RequestClaimDisposition.CLAIMED)
 
-            latest = connection.execute(
+            latest: int = connection.execute(
                 text(
                     """
                     SELECT COALESCE(MAX(o.aggregate_sequence), 0)
diff --git a/tests/persistence/test_money_precision.py b/tests/persistence/test_money_precision.py
index b869888..fce4eba 100644
--- a/tests/persistence/test_money_precision.py
+++ b/tests/persistence/test_money_precision.py
@@ -75,7 +75,7 @@ def test_numeric_24_8_round_trips_without_precision_loss(persistence: BacktestPe
     with persistence.unit_of_work() as uow:
         stored = uow.runs.get(row.id).initial_cash_amount
         # `==` on Decimal ignores trailing zeros, so read the stored digits as text too.
-        stored_text = uow.connection.execute(
+        stored_text: str = uow.connection.execute(
             text("SELECT initial_cash_amount::text FROM backtest.runs WHERE id = :id"),
             {"id": str(row.id)},
         ).scalar_one()
diff --git a/tests/persistence/test_runtime_no_ddl.py b/tests/persistence/test_runtime_no_ddl.py
index c642e72..dd97895 100644
--- a/tests/persistence/test_runtime_no_ddl.py
+++ b/tests/persistence/test_runtime_no_ddl.py
@@ -167,6 +167,6 @@ def test_ddl_really_did_not_happen(persistence: BacktestPersistence, admin_engin
         uow.connection.execute(text("CREATE TABLE backtest.sneaky (id uuid PRIMARY KEY)"))
 
     with admin_engine.connect() as connection:
-        exists = connection.execute(text("SELECT to_regclass('backtest.sneaky') IS NOT NULL")).scalar_one()
+        exists: bool = connection.execute(text("SELECT to_regclass('backtest.sneaky') IS NOT NULL")).scalar_one()
 
     assert exists is False