diff --git a/fastapi/dependencies/utils.py b/fastapi/dependencies/utils.py
index 9012dfa4b..4a8b5cf60 100644
--- a/fastapi/dependencies/utils.py
+++ b/fastapi/dependencies/utils.py
@@ -1,5 +1,4 @@
 import inspect
-from collections import defaultdict
 from contextlib import AsyncExitStack, contextmanager
 from copy import copy, deepcopy
 from dataclasses import dataclass
@@ -38,9 +37,7 @@ from fastapi._compat import (
     is_bytes_field,
     is_bytes_sequence_field,
     is_scalar_field,
-    is_scalar_mapping_field,
     is_scalar_sequence_field,
-    is_scalar_sequence_mapping_field,
     is_sequence_field,
     is_uploadfile_or_nonable_uploadfile_annotation,
     is_uploadfile_sequence_annotation,
diff --git a/tests/test_application.py b/tests/test_application.py
index eb8e73f7d..7cb5ab753 100644
--- a/tests/test_application.py
+++ b/tests/test_application.py
@@ -1,5 +1,4 @@
 import pytest
-from dirty_equals import IsDict
 from fastapi.testclient import TestClient
 
 from .main import app
@@ -55,4 +54,4 @@ def test_enum_status_code_response():
 def test_openapi_schema():
     response = client.get("/openapi.json")
     assert response.status_code == 200, response.text
-    assert response.json() == {}
\ No newline at end of file
+    assert response.json() == {}
diff --git a/tests/test_query.py b/tests/test_query.py
index b13fd12a4..40f64b0d0 100644
--- a/tests/test_query.py
+++ b/tests/test_query.py
@@ -451,4 +451,4 @@ def test_sequence_mapping_query():
 def test_sequence_mapping_query_drops_invalid():
     response = client.get("/query/mapping-sequence-params/?foo=fuzz&foo=buzz")
     assert response.status_code == 200
-    assert response.json() == "foo bar {'foo': []}"
\ No newline at end of file
+    assert response.json() == "foo bar {'foo': []}"