diff --git a/findmy/account.py b/findmy/account.py
index 9342b82..43215bc 100644
--- a/findmy/account.py
+++ b/findmy/account.py
@@ -11,7 +11,16 @@ import plistlib
 import uuid
 from datetime import datetime, timedelta, timezone
 from functools import wraps
-from typing import TYPE_CHECKING, Any, Callable, Sequence, TypedDict, TypeVar
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Callable,
+    Concatenate,
+    ParamSpec,
+    Sequence,
+    TypedDict,
+    TypeVar,
+)
 
 import bs4
 import srp._pysrp as srp
@@ -91,13 +100,16 @@ def _extract_phone_numbers(html: str) -> list[dict]:
     return data.get("direct", {}).get("phoneNumberVerification", {}).get("trustedPhoneNumbers", [])
 
 
-F = TypeVar("F", bound=Callable[[BaseAppleAccount, ...], Any])
+P = ParamSpec("P")
+R = TypeVar("R")
+A = TypeVar("A", bound=BaseAppleAccount)
+F = Callable[Concatenate[A, P], R]
 
 
 def _require_login_state(*states: LoginState) -> Callable[[F], F]:
     def decorator(func: F) -> F:
         @wraps(func)
-        def wrapper(acc: BaseAppleAccount, *args, **kwargs):
+        def wrapper(acc: A, *args: P.args, **kwargs: P.kwargs) -> R:
             if acc.login_state not in states:
                 msg = (
                     f"Invalid login state! Currently: {acc.login_state}"
@@ -320,9 +332,9 @@ class AsyncAppleAccount(BaseAppleAccount):
         return await self._login_mobileme()
 
     @_require_login_state(LoginState.REQUIRE_2FA)
-    async def get_2fa_methods(self) -> list[BaseSecondFactorMethod]:
+    async def get_2fa_methods(self) -> list[AsyncSmsSecondFactor]:
         """See `BaseAppleAccount.get_2fa_methods`."""
-        methods: list[BaseSecondFactorMethod] = []
+        methods: list[AsyncSmsSecondFactor] = []
 
         # sms
         auth_page = await self._sms_2fa_request("GET", "https://gsa.apple.com/auth")
@@ -569,7 +581,7 @@ class AsyncAppleAccount(BaseAppleAccount):
 
         return r.text()
 
-    async def _gsa_request(self, params: dict[str, Any]) -> Any:
+    async def _gsa_request(self, params: dict[str, Any]) -> dict[Any, Any]:
         request_data = {
             "cpd": {
                 "bootstrap": True,
@@ -666,7 +678,7 @@ class AppleAccount(BaseAppleAccount):
         coro = self._asyncacc.login(username, password)
         return self._loop.run_until_complete(coro)
 
-    def get_2fa_methods(self) -> list[BaseSecondFactorMethod]:
+    def get_2fa_methods(self) -> list[SmsSecondFactor]:
         """See `AsyncAppleAccount.get_2fa_methods`."""
         coro = self._asyncacc.get_2fa_methods()
         methods = self._loop.run_until_complete(coro)
diff --git a/findmy/http.py b/findmy/http.py
index d31d2d9..06d274e 100644
--- a/findmy/http.py
+++ b/findmy/http.py
@@ -5,7 +5,7 @@ import asyncio
 import json
 import logging
 import plistlib
-from typing import Any
+from typing import Any, ParamSpec
 
 from aiohttp import BasicAuth, ClientSession, ClientTimeout
 
@@ -61,6 +61,9 @@ class HttpResponse:
         return data
 
 
+P = ParamSpec("P")
+
+
 class HttpSession:
     """Asynchronous HTTP session manager. For internal use only."""
 
@@ -98,7 +101,7 @@ class HttpSession:
         method: str,
         url: str,
         auth: tuple[str] | None = None,
-        **kwargs: Any,
+        **kwargs: P.kwargs,
     ) -> HttpResponse:
         """Make an HTTP request.
 
@@ -119,10 +122,10 @@ class HttpSession:
         ) as r:
             return HttpResponse(r.status, await r.content.read())
 
-    async def get(self, url: str, **kwargs: Any) -> HttpResponse:
+    async def get(self, url: str, **kwargs: P.kwargs) -> HttpResponse:
         """Alias for `HttpSession.request("GET", ...)`."""
         return await self.request("GET", url, **kwargs)
 
-    async def post(self, url: str, **kwargs: Any) -> HttpResponse:
+    async def post(self, url: str, **kwargs: P.kwargs) -> HttpResponse:
         """Alias for `HttpSession.request("POST", ...)`."""
         return await self.request("POST", url, **kwargs)