diff --git a/README.md b/README.md
index 39d76dd..2240092 100644
--- a/README.md
+++ b/README.md
@@ -140,10 +140,10 @@ garth.login(email, password, prompt_mfa=lambda: input("Enter MFA code: "))
 For advanced use cases (like async handling), MFA can be handled separately:
 
 ```python
-result = garth.login(email, password, return_on_mfa=True)
-if isinstance(result, dict):  # MFA is required
+result1, result2 = garth.login(email, password, return_on_mfa=True)
+if result1 == "needs_mfa":  # MFA is required
     mfa_code = "123456"  # Get this from your custom MFA flow
-    oauth1, oauth2 = garth.resume_login(result['client_state'], mfa_code)
+    oauth1, oauth2 = garth.resume_login(result2, mfa_code)
 ```
 
 ### Configure
diff --git a/garth/http.py b/garth/http.py
index d086d85..40503f0 100644
--- a/garth/http.py
+++ b/garth/http.py
@@ -97,9 +97,9 @@ def user_profile(self):
             self._user_profile = self.connectapi(
                 "/userprofile-service/socialProfile"
             )
-            assert isinstance(
-                self._user_profile, dict
-            ), "No profile from connectapi"
+            assert isinstance(self._user_profile, dict), (
+                "No profile from connectapi"
+            )
         return self._user_profile
 
     @property
@@ -126,9 +126,9 @@ def request(
         if referrer is True and self.last_resp:
             headers["referer"] = self.last_resp.url
         if api:
-            assert (
-                self.oauth1_token
-            ), "OAuth1 token is required for API requests"
+            assert self.oauth1_token, (
+                "OAuth1 token is required for API requests"
+            )
             if not self.oauth2_token or self.oauth2_token.expired:
                 self.refresh_oauth2()
             headers["Authorization"] = str(self.oauth2_token)
@@ -164,6 +164,13 @@ def login(self, *args, **kwargs):
         self.oauth1_token, self.oauth2_token = sso.login(
             *args, **kwargs, client=self
         )
+        return self.oauth1_token, self.oauth2_token
+
+    def resume_login(self, *args, **kwargs):
+        self.oauth1_token, self.oauth2_token = sso.resume_login(
+            *args, **kwargs
+        )
+        return self.oauth1_token, self.oauth2_token
 
     def refresh_oauth2(self):
         assert self.oauth1_token, "OAuth1 token is required for OAuth2 refresh"
diff --git a/garth/sso.py b/garth/sso.py
index 4fe3448..408f2b0 100644
--- a/garth/sso.py
+++ b/garth/sso.py
@@ -1,7 +1,7 @@
 import asyncio
 import re
 import time
-from typing import Callable, Dict, Tuple
+from typing import Callable, Dict, Literal, Tuple
 from urllib.parse import parse_qs
 
 import requests
@@ -74,7 +74,7 @@ def login(
     client: "http.Client | None" = None,
     prompt_mfa: Callable | None = lambda: input("MFA code: "),
     return_on_mfa: bool = False,
-) -> Tuple[OAuth1Token, OAuth2Token] | dict:
+) -> Tuple[OAuth1Token, OAuth2Token] | Tuple[Literal["needs_mfa"], dict]:
     """Login to Garmin Connect.
 
     Args:
@@ -141,13 +141,10 @@ def login(
     # Handle MFA
     if "MFA" in title:
         if return_on_mfa or prompt_mfa is None:
-            return {
-                "needs_mfa": True,
-                "client_state": {
-                    "csrf_token": csrf_token,
-                    "signin_params": SIGNIN_PARAMS,
-                    "client": client,
-                },
+            return "needs_mfa", {
+                "csrf_token": csrf_token,
+                "signin_params": SIGNIN_PARAMS,
+                "client": client,
             }
 
         handle_mfa(client, SIGNIN_PARAMS, prompt_mfa)
diff --git a/garth/version.py b/garth/version.py
index 7225152..43a1e95 100644
--- a/garth/version.py
+++ b/garth/version.py
@@ -1 +1 @@
-__version__ = "0.5.2"
+__version__ = "0.5.3"
diff --git a/tests/test_http.py b/tests/test_http.py
index 1e02e8d..d92c9cf 100644
--- a/tests/test_http.py
+++ b/tests/test_http.py
@@ -113,9 +113,9 @@ def test_configure_pool_connections(client: Client):
     assert client.pool_connections == 99
     adapter = client.sess.adapters["https://"]
     assert isinstance(adapter, HTTPAdapter)
-    assert (
-        getattr(adapter, "_pool_connections", None) == 99
-    ), "Pool connections not properly configured"
+    assert getattr(adapter, "_pool_connections", None) == 99, (
+        "Pool connections not properly configured"
+    )
 
 
 @pytest.mark.vcr
@@ -247,3 +247,18 @@ def test_put(authed_client: Client):
         json=data,
     )
     assert authed_client.connectapi(path)
+
+
+@pytest.mark.vcr(record_mode="once")
+def test_resume_login(client: Client):
+    client.oauth1_token, client.oauth2_token = client.login(
+        "user@example.com", "correct_password"
+    )
+    assert client.oauth1_token
+    assert client.oauth2_token
+    client.oauth1_token, client.oauth2_token = None, None
+    assert client.oauth1_token is None
+    assert client.oauth2_token is None
+    client.resume_login("user@example.com", "correct_password")
+    assert client.oauth1_token
+    assert client.oauth2_token
diff --git a/uv.lock b/uv.lock
index a370ea4..24504a8 100644
--- a/uv.lock
+++ b/uv.lock
@@ -417,7 +417,6 @@ wheels = [
 
 [[package]]
 name = "garth"
-version = "0.5.2"
 source = { editable = "." }
 dependencies = [
     { name = "pydantic" },
@@ -499,7 +498,7 @@ name = "ipykernel"
 version = "6.29.5"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "appnope", marker = "platform_system == 'Darwin'" },
+    { name = "appnope", marker = "sys_platform == 'darwin'" },
     { name = "comm" },
     { name = "debugpy" },
     { name = "ipython" },
@@ -1336,7 +1335,7 @@ version = "1.0.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "pytest" },
-    { name = "vcrpy", version = "5.1.0", source = { registry = "https://pypi.org/simple" }, marker = "platform_python_implementation == 'PyPy' or python_full_version >= '3.11'" },
+    { name = "vcrpy", version = "5.1.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.11' or platform_python_implementation == 'PyPy'" },
     { name = "vcrpy", version = "6.0.2", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.11' and platform_python_implementation != 'PyPy'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/1a/60/104c619483c1a42775d3f8b27293f1ecfc0728014874d065e68cb9702d49/pytest-vcr-1.0.2.tar.gz", hash = "sha256:23ee51b75abbcc43d926272773aae4f39f93aceb75ed56852d0bf618f92e1896", size = 3810 }
@@ -1692,9 +1691,9 @@ resolution-markers = [
     "python_full_version >= '3.12'",
 ]
 dependencies = [
-    { name = "pyyaml", marker = "platform_python_implementation == 'PyPy' or python_full_version >= '3.11'" },
-    { name = "wrapt", marker = "platform_python_implementation == 'PyPy' or python_full_version >= '3.11'" },
-    { name = "yarl", marker = "platform_python_implementation == 'PyPy' or python_full_version >= '3.11'" },
+    { name = "pyyaml", marker = "python_full_version >= '3.11' or platform_python_implementation == 'PyPy'" },
+    { name = "wrapt", marker = "python_full_version >= '3.11' or platform_python_implementation == 'PyPy'" },
+    { name = "yarl", marker = "python_full_version >= '3.11' or platform_python_implementation == 'PyPy'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/a5/ea/a166a3cce4ac5958ba9bbd9768acdb1ba38ae17ff7986da09fa5b9dbc633/vcrpy-5.1.0.tar.gz", hash = "sha256:bbf1532f2618a04f11bce2a99af3a9647a32c880957293ff91e0a5f187b6b3d2", size = 84576 }
 wheels = [