diff --git a/docs/llms-full.txt b/docs/llms-full.txt
index 3d2dd3e3..3dffe78c 100644
--- a/docs/llms-full.txt
+++ b/docs/llms-full.txt
@@ -553,7 +553,7 @@ Run `tox run -e schema-docs` after changing supported inputs or model backends.
 
 | Format | Status | Evidence | Notes |
 |--------|--------|----------|-------|
-| OpenAPI YAML | tested | `tests/data/openapi/**/*.yaml` (34 fixtures) | Primary fixture format exercised under `tests/data/openapi/**/*.yaml`. |
+| OpenAPI YAML | tested | `tests/data/openapi/**/*.yaml` (39 fixtures) | Primary fixture format exercised under `tests/data/openapi/**/*.yaml`. |
 | OpenAPI JSON | tested | `tests/main/test_main.py::test_generate_from_json_input` | Covered by the JSON conversion CLI test in `tests/main/test_main.py`. |
 | Remote HTTP `$ref` targets | tested | `tests/main/test_main.py::test_generate_remote_ref` | Covered by the remote `$ref` generation test against a live HTTP server. |
 
@@ -562,7 +562,7 @@ Run `tox run -e schema-docs` after changing supported inputs or model backends.
 | Suite | Fixtures | Example files | Notes |
 |-------|----------|---------------|-------|
 | Default template | 20 | `body_and_parameters.yaml`, `content_in_parameters.yaml`, `content_in_parameters_inline.yaml` | Core single-file generation scenarios exercised by the main CLI tests. |
-| Coverage fixtures | 10 | `callbacks.yaml`, `callbacks_with_operation_id.yaml`, `faux_immutability.yaml` | Focused fixtures for callbacks, non-200 responses, and other regression edges. |
+| Coverage fixtures | 14 | `callbacks.yaml`, `callbacks_with_operation_id.yaml`, `faux_immutability.yaml` | Focused fixtures for callbacks, non-200 responses, and other regression edges. |
 | Custom template overrides | 1 | `custom_security.yaml` | Template override coverage for `--template-dir`. |
 | Timestamp suppression | 1 | `simple.yaml` | Fixtures that exercise `--disable-timestamp`. |
 | Remote references | 1 | `body_and_parameters.yaml` | Fixtures whose `$ref` targets are resolved over HTTP at test time. |
diff --git a/docs/supported_formats.md b/docs/supported_formats.md
index 8d37ca37..9a33dc13 100644
--- a/docs/supported_formats.md
+++ b/docs/supported_formats.md
@@ -7,7 +7,7 @@ Run `tox run -e schema-docs` after changing supported inputs or model backends.
 
 | Format | Status | Evidence | Notes |
 |--------|--------|----------|-------|
-| OpenAPI YAML | tested | `tests/data/openapi/**/*.yaml` (34 fixtures) | Primary fixture format exercised under `tests/data/openapi/**/*.yaml`. |
+| OpenAPI YAML | tested | `tests/data/openapi/**/*.yaml` (39 fixtures) | Primary fixture format exercised under `tests/data/openapi/**/*.yaml`. |
 | OpenAPI JSON | tested | `tests/main/test_main.py::test_generate_from_json_input` | Covered by the JSON conversion CLI test in `tests/main/test_main.py`. |
 | Remote HTTP `$ref` targets | tested | `tests/main/test_main.py::test_generate_remote_ref` | Covered by the remote `$ref` generation test against a live HTTP server. |
 
@@ -16,7 +16,7 @@ Run `tox run -e schema-docs` after changing supported inputs or model backends.
 | Suite | Fixtures | Example files | Notes |
 |-------|----------|---------------|-------|
 | Default template | 20 | `body_and_parameters.yaml`, `content_in_parameters.yaml`, `content_in_parameters_inline.yaml` | Core single-file generation scenarios exercised by the main CLI tests. |
-| Coverage fixtures | 10 | `callbacks.yaml`, `callbacks_with_operation_id.yaml`, `faux_immutability.yaml` | Focused fixtures for callbacks, non-200 responses, and other regression edges. |
+| Coverage fixtures | 14 | `callbacks.yaml`, `callbacks_with_operation_id.yaml`, `faux_immutability.yaml` | Focused fixtures for callbacks, non-200 responses, and other regression edges. |
 | Custom template overrides | 1 | `custom_security.yaml` | Template override coverage for `--template-dir`. |
 | Timestamp suppression | 1 | `simple.yaml` | Fixtures that exercise `--disable-timestamp`. |
 | Remote references | 1 | `body_and_parameters.yaml` | Fixtures whose `$ref` targets are resolved over HTTP at test time. |
diff --git a/fastapi_code_generator/prompt_data.py b/fastapi_code_generator/prompt_data.py
index 8d3ac75f..55d3cf64 100644
--- a/fastapi_code_generator/prompt_data.py
+++ b/fastapi_code_generator/prompt_data.py
@@ -532,7 +532,7 @@
     '\n'
     '| Format | Status | Evidence | Notes |\n'
     '|--------|--------|----------|-------|\n'
-    '| OpenAPI YAML | tested | `tests/data/openapi/**/*.yaml` (34 '
+    '| OpenAPI YAML | tested | `tests/data/openapi/**/*.yaml` (39 '
     'fixtures) | Primary fixture format exercised under '
     '`tests/data/openapi/**/*.yaml`. |\n'
     '| OpenAPI JSON | tested | '
@@ -552,7 +552,7 @@
     '`content_in_parameters.yaml`, '
     '`content_in_parameters_inline.yaml` | Core single-file '
     'generation scenarios exercised by the main CLI tests. |\n'
-    '| Coverage fixtures | 10 | `callbacks.yaml`, '
+    '| Coverage fixtures | 14 | `callbacks.yaml`, '
     '`callbacks_with_operation_id.yaml`, `faux_immutability.yaml` '
     '| Focused fixtures for callbacks, non-200 responses, and '
     'other regression edges. |\n'
diff --git a/tests/data/expected/openapi/coverage/formatter_parent_pyproject/main.py b/tests/data/expected/openapi/coverage/formatter_parent_pyproject/main.py
new file mode 100644
index 00000000..3763b7a0
--- /dev/null
+++ b/tests/data/expected/openapi/coverage/formatter_parent_pyproject/main.py
@@ -0,0 +1,20 @@
+# generated by fastapi-codegen:
+#   filename:  api.yaml
+
+from __future__ import annotations
+
+from typing import List
+
+from fastapi import FastAPI
+
+from .models import Pet
+
+app = FastAPI(
+    version='1.0.0',
+    title='Swagger Petstore',
+)
+
+
+@app.get('/pets', response_model=List[Pet])
+def list_pets() -> List[Pet]:
+    pass
diff --git a/tests/data/expected/openapi/coverage/formatter_parent_pyproject/models.py b/tests/data/expected/openapi/coverage/formatter_parent_pyproject/models.py
new file mode 100644
index 00000000..a38b4480
--- /dev/null
+++ b/tests/data/expected/openapi/coverage/formatter_parent_pyproject/models.py
@@ -0,0 +1,11 @@
+# generated by fastapi-codegen:
+#   filename:  api.yaml
+
+from __future__ import annotations
+
+from pydantic import BaseModel
+
+
+class Pet(BaseModel):
+    id: int
+    name: str
diff --git a/tests/data/expected/openapi/coverage/request_body_without_schema/main.py b/tests/data/expected/openapi/coverage/request_body_without_schema/main.py
index f66564a0..e77709b8 100644
--- a/tests/data/expected/openapi/coverage/request_body_without_schema/main.py
+++ b/tests/data/expected/openapi/coverage/request_body_without_schema/main.py
@@ -11,6 +11,6 @@
 )
 
 
-@app.post('/upload', response_model=None)
+@app.post('/upload', response_model=None, status_code=204)
 def create_upload() -> None:
     pass
diff --git a/tests/data/openapi/coverage/formatter_parent_pyproject/api.yaml b/tests/data/openapi/coverage/formatter_parent_pyproject/api.yaml
new file mode 100644
index 00000000..34981329
--- /dev/null
+++ b/tests/data/openapi/coverage/formatter_parent_pyproject/api.yaml
@@ -0,0 +1,31 @@
+openapi: "3.0.0"
+info:
+  version: 1.0.0
+  title: Swagger Petstore
+paths:
+  /pets:
+    get:
+      operationId: listPets
+      responses:
+        '200':
+          description: A paged array of pets
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Pets"
+components:
+  schemas:
+    Pet:
+      required:
+        - id
+        - name
+      properties:
+        id:
+          type: integer
+          format: int64
+        name:
+          type: string
+    Pets:
+      type: array
+      items:
+        $ref: "#/components/schemas/Pet"
diff --git a/tests/data/openapi/coverage/formatter_parent_pyproject/pyproject.toml b/tests/data/openapi/coverage/formatter_parent_pyproject/pyproject.toml
new file mode 100644
index 00000000..9a1a30ab
--- /dev/null
+++ b/tests/data/openapi/coverage/formatter_parent_pyproject/pyproject.toml
@@ -0,0 +1,3 @@
+[tool.poetry]
+name = "openapi-srv"
+version = "0.1.0"
diff --git a/tests/main/test_main.py b/tests/main/test_main.py
index f110efcf..15440ad5 100644
--- a/tests/main/test_main.py
+++ b/tests/main/test_main.py
@@ -263,6 +263,24 @@ def test_generate_from_json_input(tmp_path: Path, output_dir: Path) -> None:
     validate_generated_code(output_dir)
 
 
+@freeze_time("2020-06-19")
+def test_generate_with_parent_pyproject_formatter_settings(tmp_path: Path) -> None:
+    fixture_dir = DATA_PATH / OPEN_API_COVERAGE_DIR_NAME / "formatter_parent_pyproject"
+    project_dir = tmp_path / "project"
+    output_dir = project_dir / "app3"
+    input_path = project_dir / "api.yaml"
+    project_dir.mkdir()
+    copy2(fixture_dir / "api.yaml", input_path)
+    copy2(fixture_dir / "pyproject.toml", project_dir / "pyproject.toml")
+
+    run_cli_and_assert(
+        input_path=input_path,
+        output_path=output_dir,
+        expected_path=EXPECTED_OPENAPI_PATH / "coverage" / "formatter_parent_pyproject",
+        extra_args=["--disable-timestamp"],
+    )
+
+
 @freeze_time("2020-06-19")
 def test_generate_request_body_without_schema(output_dir: Path) -> None:
     run_cli_and_assert(