diff --git a/cachecontrol/serialize.py b/cachecontrol/serialize.py
index 51e04a6..28d3dc9 100644
--- a/cachecontrol/serialize.py
+++ b/cachecontrol/serialize.py
@@ -11,10 +11,10 @@
 from urllib3 import HTTPResponse
 
 if TYPE_CHECKING:
-    from requests import PreparedRequest, Request
+    from requests import PreparedRequest
 
 
-class Serializer(object):
+class Serializer:
     serde_version = "4"
 
     def dumps(
@@ -99,7 +99,7 @@ def loads(
 
     def prepare_response(
         self,
-        request: Request,
+        request: PreparedRequest,
         cached: Mapping[str, Any],
         body_file: IO[bytes] | None = None,
     ) -> HTTPResponse | None:
@@ -151,7 +151,7 @@ def prepare_response(
 
     def _loads_v0(
         self,
-        request: Request,
+        request: PreparedRequest,
         data: bytes,
         body_file: IO[bytes] | None = None,
     ) -> None:
@@ -162,7 +162,7 @@ def _loads_v0(
 
     def _loads_v1(
         self,
-        request: Request,
+        request: PreparedRequest,
         data: bytes,
         body_file: IO[bytes] | None = None,
     ) -> HTTPResponse | None:
@@ -172,7 +172,7 @@ def _loads_v1(
 
     def _loads_v2(
         self,
-        request: Request,
+        request: PreparedRequest,
         data: bytes,
         body_file: IO[bytes] | None = None,
     ) -> HTTPResponse | None:
@@ -183,7 +183,7 @@ def _loads_v2(
 
     def _loads_v3(
         self,
-        request: Request,
+        request: PreparedRequest,
         data: bytes,
         body_file: IO[bytes] | None = None,
     ) -> None:
@@ -194,7 +194,7 @@ def _loads_v3(
 
     def _loads_v4(
         self,
-        request: Request,
+        request: PreparedRequest,
         data: bytes,
         body_file: IO[bytes] | None = None,
     ) -> HTTPResponse | None:
diff --git a/dev_requirements.txt b/dev_requirements.txt
index 31c7288..5813414 100644
--- a/dev_requirements.txt
+++ b/dev_requirements.txt
@@ -2,15 +2,13 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
--e .
+-e .[filecache,redis]
 
 tox
 pytest-cov
 pytest
 cherrypy
 sphinx
-redis
-filelock
 bumpversion
 twine
 black