diff --git a/python/setup.py b/python/setup.py
index 9288f33..736c2ec 100644
--- a/python/setup.py
+++ b/python/setup.py
@@ -12,7 +12,7 @@
     version=VERSION,
     packages=find_packages(),
     install_requires=[
-        "eip712==0.1.0",
+        "eip712>=0.2.0",
         "eth-typing>=2.3.0",
         "web3>=5.30.0",
     ],
diff --git a/python/web3login/auth.py b/python/web3login/auth.py
index b5804f8..1c5be8c 100644
--- a/python/web3login/auth.py
+++ b/python/web3login/auth.py
@@ -2,9 +2,11 @@
 from typing import Any, Dict, cast
 
 import eth_keys  # type: ignore
-from eip712.messages import EIP712Message, _hash_eip191_message
+from eip712.messages import EIP712Message
 from eth_account._utils.signing import sign_message_hash
-from eth_typing import ChecksumAddress
+from eth_account.messages import SignableMessage
+from eth_typing import ChecksumAddress, Hash32
+from eth_utils.curried import ValidationError, keccak
 from hexbytes import HexBytes
 from web3 import Web3
 
@@ -52,7 +54,6 @@ class Web3Authorization(EIP712Message):
 
 
 def sign_message(message_hash_bytes: HexBytes, private_key: HexBytes) -> HexBytes:
-
     eth_private_key = eth_keys.keys.PrivateKey(private_key)
     _, _, _, signed_message_bytes = sign_message_hash(
         eth_private_key, message_hash_bytes
@@ -60,6 +61,19 @@ def sign_message(message_hash_bytes: HexBytes, private_key: HexBytes) -> HexByte
     return signed_message_bytes
 
 
+def hash_eip191_message(signable_message: SignableMessage) -> Hash32:
+    # https://github.com/ethereum/eth-account/blob/50ccddf/eth_account/messages.py#L65
+    version = signable_message.version
+    if len(version) != 1:
+        raise ValidationError(
+            f"The supplied message version is {version!r}. "
+            "The EIP-191 signable message standard only supports one-byte versions."
+        )
+
+    joined = b"\x19" + version + signable_message.header + signable_message.body
+    return Hash32(keccak(joined))
+
+
 def authorize(
     deadline: int, address: str, application: str, private_key: HexBytes
 ) -> Dict[str, Any]:
@@ -74,7 +88,7 @@ def authorize(
         application=application,
     )  # type: ignore
 
-    msg_hash_bytes = HexBytes(_hash_eip191_message(message.signable_message))
+    msg_hash_bytes = HexBytes(hash_eip191_message(message.signable_message))
 
     signed_message = sign_message(msg_hash_bytes, private_key)
 
diff --git a/python/web3login/middlewares/fastapi.py b/python/web3login/middlewares/fastapi.py
index 6eb4149..4e8f31a 100644
--- a/python/web3login/middlewares/fastapi.py
+++ b/python/web3login/middlewares/fastapi.py
@@ -6,6 +6,7 @@
 
 from fastapi import Request, Response
 from fastapi.exceptions import HTTPException
+from fastapi.openapi.models import OAuthFlowPassword
 from fastapi.openapi.models import OAuthFlows as OAuthFlowsModel
 from fastapi.security import OAuth2
 from fastapi.security.utils import get_authorization_scheme_param
@@ -35,7 +36,13 @@ def __init__(
     ):
         if not scopes:
             scopes = {}
-        flows = OAuthFlowsModel(password={"tokenUrl": tokenUrl, "scopes": scopes})
+
+        flows = OAuthFlowsModel(
+            password=OAuthFlowPassword(
+                tokenUrl=tokenUrl,
+                scopes=scopes,
+            )
+        )
         super().__init__(
             flows=flows,
             scheme_name=scheme_name,
@@ -74,7 +81,12 @@ def __init__(
     ):
         if not scopes:
             scopes = {}
-        flows = OAuthFlowsModel(password={"tokenUrl": tokenUrl, "scopes": scopes})
+        flows = OAuthFlowsModel(
+            password=OAuthFlowPassword(
+                tokenUrl=tokenUrl,
+                scopes=scopes,
+            )
+        )
         super().__init__(
             flows=flows,
             scheme_name=scheme_name,