diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e18e49c..ea0dd8e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     runs-on: ${{ matrix.os }}
@@ -29,6 +29,10 @@ jobs:
       uses: actions/setup-python@v3
       with:
         python-version: ${{ matrix.python-version }}
+    - if: matrix.os == 'macos-latest' && matrix.python-version == '3.11'
+      name: Install build tools
+      run: |
+        brew install automake
 
     - name: Install Poetry
       uses: abatilo/actions-poetry@v2
diff --git a/src/babble/auth.py b/src/babble/auth.py
index 4a3aca9..8030d03 100644
--- a/src/babble/auth.py
+++ b/src/babble/auth.py
@@ -7,6 +7,7 @@
 
 from .config import AUTH_SERVER
 from .crypto.identity import Identity
+from .encoding import to_base64, from_base64
 
 
 @dataclass
@@ -17,43 +18,62 @@ class TokenMetadata:
     expires_at: datetime
 
 
-def authenticate(identity: Identity) -> Tuple[str, TokenMetadata]:
+def authenticate(identity: Identity, name: str = None) -> Tuple[str, TokenMetadata]:
     r = requests.post(
-        f"{AUTH_SERVER}/request_token",
+        f"{AUTH_SERVER}/auth/login/wallet/challenge",
         json={
             "address": identity.address,
-            "public_key": identity.public_key,
+            "client_id": name if name else "uagent",
         },
     )
     r.raise_for_status()
+    resp = r.json()
 
-    payload = r.json()["payload"]
+    payload = resp["challenge"]
 
     # create the signature
-    signed_bytes, signature = identity.sign_arbitrary(payload.encode())
+    _, signature = identity.sign_arbitrary(payload.encode())
 
-    r = requests.post(
-        f"{AUTH_SERVER}/login",
-        json={
-            "public_key": identity.public_key,
-            "signed_bytes": signed_bytes,
-            "signature": signature,
+    login_request = {
+        "address": identity.address,
+        "public_key": {
+            "value": to_base64(bytes.fromhex(identity.public_key)),
+            "type": "tendermint/PubKeySecp256k1",
         },
+        "nonce": resp["nonce"],
+        "challenge": resp["challenge"],
+        "signature": signature,
+        "client_id": name if name else "uagent",
+        "scope": "",
+    }
+
+    r = requests.post(
+        f"{AUTH_SERVER}/auth/login/wallet/verify",
+        json=login_request,
+    )
+    r.raise_for_status()
+
+    r = requests.post(
+        f"{AUTH_SERVER}/tokens",
+        json=r.json(),
     )
     r.raise_for_status()
 
     # extract the token
-    token = str(r.json()["token"])
+    token = str(r.json()["access_token"])
 
     # parse the token
     token_data = jwt.decode(
-        token, algorithms=["RS*"], options={"verify_signature": False}
+        token,
+        algorithms=["RS*"],
+        options={"verify_signature": False},
+        issuer="fetch.ai",
     )
 
     # build the token metadata
     metadata = TokenMetadata(
-        address=str(token_data["name"]),
-        public_key=str(token_data["pubkey"]),
+        address=identity.address,
+        public_key=from_base64(str(token_data["pk"])).hex(),
         issued_at=datetime.fromtimestamp(token_data["iat"], timezone.utc),
         expires_at=datetime.fromtimestamp(token_data["exp"], timezone.utc),
     )
diff --git a/src/babble/client.py b/src/babble/client.py
index b922caf..f1eb761 100644
--- a/src/babble/client.py
+++ b/src/babble/client.py
@@ -43,6 +43,7 @@ def __init__(
         signed_obj_base64: str,
         identity: Identity,
         chain_id: str,
+        name: str = None,
     ):
         _validate_address(delegate_address)
 
@@ -53,6 +54,7 @@ def __init__(
         self._signed_obj_base64 = signed_obj_base64
         self._identity = identity
         self._chain_id = chain_id
+        self._name = name
 
         # build and restore the delivered set
         self._last_rx_timestamp = self._now()
@@ -70,7 +72,7 @@ def _update_authentication(self):
             or self._token_metadata.expires_at
             < self._now() - timedelta(seconds=EXPIRATION_BUFFER_SECONDS)
         ):
-            self._token, self._token_metadata = authenticate(self._identity)
+            self._token, self._token_metadata = authenticate(self._identity, self._name)
 
     def __repr__(self):
         return f"{self._delegate_address}  ({self._identity.public_key})"
diff --git a/src/babble/config.py b/src/babble/config.py
index cf756de..e8c456c 100644
--- a/src/babble/config.py
+++ b/src/babble/config.py
@@ -1,8 +1,6 @@
 import os
 
-AUTH_SERVER = os.environ.get(
-    "AUTH_SERVER", "https://auth-attila.sandbox-london-b.fetch-ai.com"
-)
+AUTH_SERVER = os.environ.get("AUTH_SERVER", "https://accounts.fetch.ai/v1")
 MEMORANDUM_SERVER = os.environ.get(
     "MEMORANDUM_SERVER",
     "https://messaging-server.sandbox-london-b.fetch-ai.com/graphql",