diff --git a/python/wreq/header.py b/python/wreq/header.py
index 50d44d13..22291ae1 100644
--- a/python/wreq/header.py
+++ b/python/wreq/header.py
@@ -11,7 +11,7 @@
 Set-Cookie, Accept-Encoding, etc.).
 """
 
-from typing import Dict, Iterator, Sequence, Tuple
+from typing import Mapping, Iterator, Sequence, Tuple
 
 __all__ = ["HeaderMap", "OrigHeaderMap"]
 
@@ -58,7 +58,7 @@ def __str__(self) -> str:
         ...
 
     def __init__(
-        self, init: Dict[str, str] | None = None, capacity: int | None = None
+        self, init: Mapping[str, str] | None = None, capacity: int | None = None
     ) -> None:
         """
         Create a new HeaderMap.
diff --git a/python/wreq/proxy.py b/python/wreq/proxy.py
index 768a1674..2f7e03d7 100644
--- a/python/wreq/proxy.py
+++ b/python/wreq/proxy.py
@@ -1,4 +1,4 @@
-from typing import Dict, NotRequired, TypedDict, Unpack, final
+from typing import Mapping, NotRequired, TypedDict, Unpack, final
 
 from wreq.header import HeaderMap
 
@@ -15,7 +15,7 @@ class ProxyConfig(TypedDict):
     custom_http_auth: NotRequired[str]
     r"""Custom HTTP proxy authentication header value."""
 
-    custom_http_headers: NotRequired[Dict[str, str] | HeaderMap]
+    custom_http_headers: NotRequired[Mapping[str, str] | HeaderMap]
     r"""Custom HTTP proxy headers."""
 
     exclusion: NotRequired[str]
diff --git a/python/wreq/wreq.py b/python/wreq/wreq.py
index 2be42022..52584323 100644
--- a/python/wreq/wreq.py
+++ b/python/wreq/wreq.py
@@ -5,10 +5,10 @@
 from typing import (
     Any,
     AsyncGenerator,
-    Dict,
     Generator,
     NotRequired,
     Sequence,
+    Mapping,
     Tuple,
     TypedDict,
     Unpack,
@@ -527,7 +527,7 @@ class ClientConfig(TypedDict):
     Sets the `User-Agent` header to be used by this client.
     """
 
-    headers: NotRequired[Dict[str, str] | HeaderMap]
+    headers: NotRequired[Mapping[str, str] | HeaderMap]
     """
     Sets the default headers for every request.
     """
@@ -795,7 +795,7 @@ class Request(TypedDict):
     The Emulation settings for the request.
     """
 
-    headers: NotRequired[Dict[str, str] | HeaderMap]
+    headers: NotRequired[Mapping[str, str] | HeaderMap]
     """
     The headers to use for the request.
     """
@@ -810,7 +810,7 @@ class Request(TypedDict):
     The option enables default headers.
     """
 
-    cookies: NotRequired[str | Dict[str, str]]
+    cookies: NotRequired[str | Mapping[str, str]]
     """
     The cookies to use for the request.
     """
@@ -916,7 +916,7 @@ class Request(TypedDict):
 
     query: NotRequired[
         Sequence[Tuple[str, str | int | float | bool]]
-        | Dict[str, str | int | float | bool]
+        | Mapping[str, str | int | float | bool]
     ]
     """
     The query parameters to use for the request.
@@ -924,7 +924,7 @@ class Request(TypedDict):
 
     form: NotRequired[
         Sequence[Tuple[str, str | int | float | bool]]
-        | Dict[str, str | int | float | bool]
+        | Mapping[str, str | int | float | bool]
     ]
     """
     The form parameters to use for the request.
@@ -940,7 +940,7 @@ class Request(TypedDict):
         | bytes
         | Sequence[Tuple[str, str]]
         | Tuple[str, str | int | float | bool]
-        | Dict[str, str | int | float | bool]
+        | Mapping[str, str | int | float | bool]
         | Any
         | Generator[bytes, str, None]
         | AsyncGenerator[bytes, str]
@@ -981,7 +981,7 @@ class WebSocketRequest(TypedDict):
     Bind to an interface by SO_BINDTODEVICE.
     """
 
-    headers: NotRequired[Dict[str, str] | HeaderMap]
+    headers: NotRequired[Mapping[str, str] | HeaderMap]
     """
     The headers to use for the request.
     """
@@ -996,7 +996,7 @@ class WebSocketRequest(TypedDict):
     The option enables default headers.
     """
 
-    cookies: NotRequired[str | Dict[str, str]]
+    cookies: NotRequired[str | Mapping[str, str]]
     """
     The cookies to use for the request.
     """
@@ -1028,7 +1028,7 @@ class WebSocketRequest(TypedDict):
 
     query: NotRequired[
         Sequence[Tuple[str, str | int | float | bool]]
-        | Dict[str, str | int | float | bool]
+        | Mapping[str, str | int | float | bool]
     ]
     """
     The query parameters to use for the request.