diff --git a/ci/latest/requirements.txt b/ci/latest/requirements.txt
index 3fb2a97..174aeb4 100644
--- a/ci/latest/requirements.txt
+++ b/ci/latest/requirements.txt
@@ -6,7 +6,7 @@ nextline-graphql==0.7.9
 transitions==0.9.2
 httpx==0.27.0
 hypothesis==6.105.1
-black==24.4.2
+black==24.8.0
 pytest-asyncio==0.23.7
 pytest-cov==5.0.0
 pytest==8.3.2
diff --git a/tests/schema/mutations/test_queue_push.py b/tests/schema/mutations/test_queue_push.py
index 253c9f1..3fe1127 100644
--- a/tests/schema/mutations/test_queue_push.py
+++ b/tests/schema/mutations/test_queue_push.py
@@ -3,6 +3,7 @@
 from deepdiff import DeepDiff
 from hypothesis import Phase, given, settings
 from hypothesis import strategies as st
+from strawberry.types import ExecutionResult
 
 from nextline_schedule.graphql import MUTATE_QUEUE_PUSH
 from nextline_schedule.queue.strategies import Queue, st_push_arg, st_queue
@@ -40,6 +41,7 @@ async def test_schema(queue: Queue, input: Input, schema: Schema) -> None:
             context_value=context_values,
             variable_values=variable_values,
         )
+        assert isinstance(resp, ExecutionResult)
         assert (data := resp.data)
         assert_data(data, input)
         assert_queue_item(queue, data, input, len_ini)
diff --git a/tests/schema/queries/test_queue_items.py b/tests/schema/queries/test_queue_items.py
index 965a537..88dd5e1 100644
--- a/tests/schema/queries/test_queue_items.py
+++ b/tests/schema/queries/test_queue_items.py
@@ -1,4 +1,5 @@
 from hypothesis import given
+from strawberry.types import ExecutionResult
 
 from nextline_schedule.graphql import QUERY_QUEUE_ITEMS
 from nextline_schedule.queue.strategies import Queue, st_queue
@@ -11,5 +12,6 @@ async def test_schema(queue: Queue, schema: Schema):
         context_schedule = {'queue': queue}
         context = {'schedule': context_schedule}
         resp = await schema.execute(QUERY_QUEUE_ITEMS, context_value=context)
+        assert isinstance(resp, ExecutionResult)
         assert resp.data
         assert len(resp.data['schedule']['queue']['items']) == len(queue.items)
diff --git a/tests/schema/queries/test_version.py b/tests/schema/queries/test_version.py
index fa83290..e989aab 100644
--- a/tests/schema/queries/test_version.py
+++ b/tests/schema/queries/test_version.py
@@ -1,3 +1,5 @@
+from strawberry.types import ExecutionResult
+
 import nextline_schedule
 from nextline_schedule.graphql import QUERY_VERSION
 from tests.schema.conftest import Schema
@@ -5,5 +7,6 @@
 
 async def test_schema(schema: Schema) -> None:
     resp = await schema.execute(QUERY_VERSION)
+    assert isinstance(resp, ExecutionResult)
     assert resp.data
     assert resp.data['schedule']['version'] == nextline_schedule.__version__