diff --git a/packages/sshecret-sshd/src/sshecret_sshd/cli.py b/packages/sshecret-sshd/src/sshecret_sshd/cli.py
index 7f967c8..1416ead 100644
--- a/packages/sshecret-sshd/src/sshecret_sshd/cli.py
+++ b/packages/sshecret-sshd/src/sshecret_sshd/cli.py
@@ -1,4 +1,5 @@
 """CLI app."""
+
 import logging
 import asyncio
 import sys
@@ -12,7 +13,9 @@ from .ssh_server import start_server
 LOG = logging.getLogger()
 
 handler = logging.StreamHandler()
-formatter = logging.Formatter("%(created)f:%(levelname)s:%(name)s:%(module)s:%(message)s")
+formatter = logging.Formatter(
+    "%(created)f:%(levelname)s:%(name)s:%(module)s:%(message)s"
+)
 
 handler.setFormatter(formatter)
 LOG.addHandler(handler)
diff --git a/packages/sshecret-sshd/src/sshecret_sshd/constants.py b/packages/sshecret-sshd/src/sshecret_sshd/constants.py
index dfaea77..df1776f 100644
--- a/packages/sshecret-sshd/src/sshecret_sshd/constants.py
+++ b/packages/sshecret-sshd/src/sshecret_sshd/constants.py
@@ -11,4 +11,6 @@ SERVER_KEY_TYPE = "ed25519"
 ERROR_BACKEND_ERROR = "Error: Unexpected response or error from backend"
 ERROR_INFO_BACKEND_GONE = "Unexpected error: Backend connection lost."
 ERROR_INFO_USERNAME_GONE = "Unexpected error: Username lost in transit."
-ERROR_INFO_REMOTE_IP_GONE = "Unexpected error: Client connection details lost in transit."
+ERROR_INFO_REMOTE_IP_GONE = (
+    "Unexpected error: Client connection details lost in transit."
+)
diff --git a/packages/sshecret-sshd/src/sshecret_sshd/settings.py b/packages/sshecret-sshd/src/sshecret_sshd/settings.py
index 42843b0..9ea0b7e 100644
--- a/packages/sshecret-sshd/src/sshecret_sshd/settings.py
+++ b/packages/sshecret-sshd/src/sshecret_sshd/settings.py
@@ -13,9 +13,11 @@ class ClientRegistrationSettings(BaseModel):
     """Client registration settings."""
 
     enabled: bool = False
-    allow_from: Annotated[list[IPvAnyNetwork], ForceDecode] = Field(default_factory=list)
+    allow_from: Annotated[list[IPvAnyNetwork], ForceDecode] = Field(
+        default_factory=list
+    )
 
-    @field_validator('allow_from', mode="before")
+    @field_validator("allow_from", mode="before")
     @classmethod
     def ensure_allow_from_list(cls, value: Any) -> list[IPvAnyNetwork]:
         """Convert allow_from to a list."""
@@ -34,15 +36,20 @@ class ClientRegistrationSettings(BaseModel):
                 allow_from.append(entry)
         return allow_from
 
+
 class ServerSettings(BaseSettings):
     """Server Settings."""
 
-    model_config = SettingsConfigDict(env_file=".sshd.env", env_prefix="sshecret_sshd_", env_nested_delimiter='_')
+    model_config = SettingsConfigDict(
+        env_file=".sshd.env", env_prefix="sshecret_sshd_", env_nested_delimiter="_"
+    )
 
     backend_url: AnyHttpUrl = Field(alias="sshecret_backend_url")
     backend_token: str
     listen_address: str = Field(default="127.0.0.1")
     port: int = DEFAULT_LISTEN_PORT
-    registration: ClientRegistrationSettings = Field(default_factory=ClientRegistrationSettings)
+    registration: ClientRegistrationSettings = Field(
+        default_factory=ClientRegistrationSettings
+    )
     debug: bool = False
     enable_ping_command: bool = False
diff --git a/packages/sshecret-sshd/src/sshecret_sshd/ssh_server.py b/packages/sshecret-sshd/src/sshecret_sshd/ssh_server.py
index baccca0..792945c 100644
--- a/packages/sshecret-sshd/src/sshecret_sshd/ssh_server.py
+++ b/packages/sshecret-sshd/src/sshecret_sshd/ssh_server.py
@@ -54,7 +54,10 @@ def audit_process(
             data["command"] = cmd
         data["args"] = " ".join(cmd_args)
 
-    backend.audit(SubSystem.SSHD).write(operation, message, remote_ip, client, secret=None, secret_name=secret, **data)
+    backend.audit(SubSystem.SSHD).write(
+        operation, message, remote_ip, client, secret=None, secret_name=secret, **data
+    )
+
 
 def audit_event(
     backend: SshecretBackend,
@@ -67,7 +70,10 @@ def audit_event(
     """Add an audit event."""
     if not origin:
         origin = "UNKNOWN"
-    backend.audit(SubSystem.SSHD).write(operation, message, origin, client, secret=None, secret_name=secret)
+    backend.audit(SubSystem.SSHD).write(
+        operation, message, origin, client, secret=None, secret_name=secret
+    )
+
 
 def verify_key_input(public_key: str) -> str | None:
     """Verify key input."""
@@ -118,14 +124,19 @@ def get_info_remote_ip(process: asyncssh.SSHServerProcess[str]) -> str | None:
 
     return remote_ip
 
-def get_info_allowed_registration(process: asyncssh.SSHServerProcess[str]) -> list[IPvAnyNetwork] | None:
+
+def get_info_allowed_registration(
+    process: asyncssh.SSHServerProcess[str],
+) -> list[IPvAnyNetwork] | None:
     """Get allowed networks to allow registration from."""
 
-    allowed_registration = cast(list[IPvAnyNetwork] | None, process.get_extra_info("allow_registration_from", None))
+    allowed_registration = cast(
+        list[IPvAnyNetwork] | None,
+        process.get_extra_info("allow_registration_from", None),
+    )
     return allowed_registration
 
 
-
 def get_optional_commands(process: asyncssh.SSHServerProcess[str]) -> dict[str, bool]:
     """Get optional command state."""
     with_registration = cast(
@@ -236,7 +247,12 @@ async def dispatch_cmd_register(process: asyncssh.SSHServerProcess[str]) -> None
     allowed_networks = get_info_allowed_registration(process)
     if not allowed_networks:
         process.stdout.write("Unauthorized.\n")
-        audit_process(backend, process, Operation.DENY, "Received registration command, but no subnets are allowed.")
+        audit_process(
+            backend,
+            process,
+            Operation.DENY,
+            "Received registration command, but no subnets are allowed.",
+        )
         return
 
     remote_ip = get_info_remote_ip(process)
@@ -250,7 +266,12 @@ async def dispatch_cmd_register(process: asyncssh.SSHServerProcess[str]) -> None
         if client_address in network:
             break
     else:
-        audit_process(backend, process, Operation.DENY, "Received registration command from unauthorized subnet.")
+        audit_process(
+            backend,
+            process,
+            Operation.DENY,
+            "Received registration command from unauthorized subnet.",
+        )
         process.stdout.write("Unauthorized.\n")
         return
 
@@ -369,7 +390,6 @@ class AsshyncServer(asyncssh.SSHServer):
                 self._conn.set_extra_info(client=client)
                 self._conn.set_authorized_keys(key)
             else:
-
                 audit_event(
                     self.backend,
                     "Client denied due to policy",
@@ -380,8 +400,12 @@ class AsshyncServer(asyncssh.SSHServer):
                 LOG.warning("Client connection denied due to policy.")
         elif self.registration_enabled:
             self._conn.set_extra_info(provided_username=username)
-            self._conn.set_extra_info(allow_registration_from=self.allow_registration_from)
-            LOG.warning("Registration enabled, and client is not recognized. Bypassing authentication.")
+            self._conn.set_extra_info(
+                allow_registration_from=self.allow_registration_from
+            )
+            LOG.warning(
+                "Registration enabled, and client is not recognized. Bypassing authentication."
+            )
             return False
 
         LOG.debug("Continuing to regular authentication")
diff --git a/packages/sshecret-sshd/tests/conftest.py b/packages/sshecret-sshd/tests/conftest.py
index b9d809d..daeec14 100644
--- a/packages/sshecret-sshd/tests/conftest.py
+++ b/packages/sshecret-sshd/tests/conftest.py
@@ -10,15 +10,26 @@ from ipaddress import IPv4Network, IPv6Network
 from sshecret_sshd.ssh_server import run_ssh_server
 from sshecret_sshd.settings import ClientRegistrationSettings
 
-from .types import Client, ClientKey, ClientRegistry, SshServerFixtureFun, SshServerFixture
+from .types import (
+    Client,
+    ClientKey,
+    ClientRegistry,
+    SshServerFixtureFun,
+    SshServerFixture,
+)
+
 
 @pytest.fixture(scope="function")
 def client_registry() -> ClientRegistry:
     clients = {}
     secrets = {}
 
-    async def add_client(name: str, secret_names: list[str]|None=None, policies: list[str]|None=None) -> str:
-        private_key = asyncssh.generate_private_key('ssh-rsa')
+    async def add_client(
+        name: str,
+        secret_names: list[str] | None = None,
+        policies: list[str] | None = None,
+    ) -> str:
+        private_key = asyncssh.generate_private_key("ssh-rsa")
         public_key = private_key.export_public_key()
         clients[name] = ClientKey(name, private_key, public_key.decode().rstrip())
         secrets.update({(name, s): f"mocked-secret-{s}" for s in (secret_names or [])})
@@ -26,11 +37,12 @@ def client_registry() -> ClientRegistry:
 
     return {"clients": clients, "secrets": secrets, "add_client": add_client}
 
+
 @pytest.fixture(scope="function")
 async def mock_backend(client_registry: ClientRegistry) -> MagicMock:
     backend = MagicMock()
-    clients_data = client_registry['clients']
-    secrets_data = client_registry['secrets']
+    clients_data = client_registry["clients"]
+    secrets_data = client_registry["secrets"]
 
     async def get_client(name: str) -> Client | None:
         client_key = clients_data.get(name)
@@ -41,7 +53,7 @@ async def mock_backend(client_registry: ClientRegistry) -> MagicMock:
                 description=f"Mock client {name}",
                 public_key=client_key.public_key,
                 secrets=[s for (c, s) in secrets_data if c == name],
-                policies=[IPv4Network('0.0.0.0/0'), IPv6Network('::/0')],
+                policies=[IPv4Network("0.0.0.0/0"), IPv6Network("::/0")],
             )
             return response_model
         return None
@@ -57,7 +69,9 @@ async def mock_backend(client_registry: ClientRegistry) -> MagicMock:
         Otherwise we can't test this...
         """
         if "template" not in clients_data:
-            raise RuntimeError("Error, must have a client called template for this to work.")
+            raise RuntimeError(
+                "Error, must have a client called template for this to work."
+            )
         clients_data[name] = clients_data["template"]
         for secret_key, secret in secrets_data.items():
             s_client, secret_name = secret_key
@@ -76,18 +90,22 @@ async def mock_backend(client_registry: ClientRegistry) -> MagicMock:
 
     return backend
 
+
 @pytest.fixture(scope="function")
-async def ssh_server(mock_backend: MagicMock, unused_tcp_port: int) -> SshServerFixtureFun:
+async def ssh_server(
+    mock_backend: MagicMock, unused_tcp_port: int
+) -> SshServerFixtureFun:
     port = unused_tcp_port
 
-    private_key = asyncssh.generate_private_key('ssh-ed25519')
+    private_key = asyncssh.generate_private_key("ssh-ed25519")
     key_str = private_key.export_private_key()
-    with tempfile.NamedTemporaryFile('w+', delete=True) as key_file:
-
+    with tempfile.NamedTemporaryFile("w+", delete=True) as key_file:
         key_file.write(key_str.decode())
         key_file.flush()
 
-        registration_settings = ClientRegistrationSettings(enabled=True, allow_from=[IPv4Network("0.0.0.0/0")])
+        registration_settings = ClientRegistrationSettings(
+            enabled=True, allow_from=[IPv4Network("0.0.0.0/0")]
+        )
         server = await run_ssh_server(
             backend=mock_backend,
             listen_address="localhost",
@@ -104,6 +122,7 @@ async def ssh_server(mock_backend: MagicMock, unused_tcp_port: int) -> SshServer
         server.close()
         await server.wait_closed()
 
+
 @pytest.fixture(scope="function")
 def ssh_command_runner(ssh_server: SshServerFixture, client_registry: ClientRegistry):
     """Run a single command.
@@ -113,7 +132,7 @@ def ssh_command_runner(ssh_server: SshServerFixture, client_registry: ClientRegi
     _, port = ssh_server
 
     async def run_command_as(name: str, command: str):
-        client_key = client_registry['clients'][name]
+        client_key = client_registry["clients"][name]
         conn = await asyncssh.connect(
             "127.0.0.1",
             port=port,
diff --git a/packages/sshecret-sshd/tests/test_get_secret.py b/packages/sshecret-sshd/tests/test_get_secret.py
index dca1645..b129a7c 100644
--- a/packages/sshecret-sshd/tests/test_get_secret.py
+++ b/packages/sshecret-sshd/tests/test_get_secret.py
@@ -4,11 +4,14 @@ import pytest
 
 from .types import ClientRegistry, CommandRunner
 
+
 @pytest.mark.asyncio
-async def test_get_secret(ssh_command_runner: CommandRunner, client_registry: ClientRegistry) -> None:
+async def test_get_secret(
+    ssh_command_runner: CommandRunner, client_registry: ClientRegistry
+) -> None:
     """Test that we can get a secret."""
 
-    await client_registry['add_client']("test-client", ["mysecret"])
+    await client_registry["add_client"]("test-client", ["mysecret"])
 
     result = await ssh_command_runner("test-client", "get_secret mysecret")
 
@@ -18,10 +21,12 @@ async def test_get_secret(ssh_command_runner: CommandRunner, client_registry: Cl
 
 
 @pytest.mark.asyncio
-async def test_invalid_secret_name(ssh_command_runner: CommandRunner, client_registry: ClientRegistry) -> None:
+async def test_invalid_secret_name(
+    ssh_command_runner: CommandRunner, client_registry: ClientRegistry
+) -> None:
     """Test getting an invalid secret name."""
 
-    await client_registry['add_client']("test-client")
+    await client_registry["add_client"]("test-client")
 
     result = await ssh_command_runner("test-client", "get_secret mysecret")
     assert result.exit_status == 1
diff --git a/packages/sshecret-sshd/tests/test_ping.py b/packages/sshecret-sshd/tests/test_ping.py
index a83ef50..791c01a 100644
--- a/packages/sshecret-sshd/tests/test_ping.py
+++ b/packages/sshecret-sshd/tests/test_ping.py
@@ -2,10 +2,13 @@ import pytest
 
 from .types import ClientRegistry, CommandRunner
 
+
 @pytest.mark.asyncio
-async def test_ping_command(ssh_command_runner: CommandRunner, client_registry: ClientRegistry) -> None:
+async def test_ping_command(
+    ssh_command_runner: CommandRunner, client_registry: ClientRegistry
+) -> None:
     # Register a test client with default policies and no secrets
-    await client_registry['add_client']('test-pinger')
+    await client_registry["add_client"]("test-pinger")
 
     result = await ssh_command_runner("test-pinger", "ping")
 
diff --git a/packages/sshecret-sshd/tests/test_register.py b/packages/sshecret-sshd/tests/test_register.py
index 432f57c..2e6c3c5 100644
--- a/packages/sshecret-sshd/tests/test_register.py
+++ b/packages/sshecret-sshd/tests/test_register.py
@@ -1,10 +1,16 @@
 """Test registration."""
+
 import pytest
 
 from .types import ClientRegistry, CommandRunner, ProcessRunner
 
+
 @pytest.mark.asyncio
-async def test_register_client(ssh_session: ProcessRunner, ssh_command_runner: CommandRunner, client_registry: ClientRegistry) -> None:
+async def test_register_client(
+    ssh_session: ProcessRunner,
+    ssh_command_runner: CommandRunner,
+    client_registry: ClientRegistry,
+) -> None:
     """Test client registration."""
     await client_registry["add_client"]("template", ["testsecret"])
 
@@ -12,9 +18,9 @@ async def test_register_client(ssh_session: ProcessRunner, ssh_command_runner: C
 
     async with ssh_session("newclient", "register", "template") as session:
         maxlines = 10
-        l = 0
+        linenum = 0
         found = False
-        while l < maxlines:
+        while linenum < maxlines:
             line = await session.stdout.readline()
             if "Enter public key" in line:
                 found = True
diff --git a/packages/sshecret-sshd/tests/types.py b/packages/sshecret-sshd/tests/types.py
index 9b6187b..aa009cb 100644
--- a/packages/sshecret-sshd/tests/types.py
+++ b/packages/sshecret-sshd/tests/types.py
@@ -1,9 +1,10 @@
 """Types for the various test properties."""
+
 import uuid
 from datetime import datetime
 from dataclasses import dataclass, field
 from ipaddress import IPv4Network, IPv6Network
-from collections.abc import AsyncGenerator, Awaitable, Callable, AsyncIterator
+from collections.abc import AsyncGenerator, Awaitable, Callable
 from typing import Any, Protocol, TypedDict, AsyncContextManager
 import asyncssh
 
@@ -11,8 +12,6 @@ SshServerFixture = tuple[str, int]
 SshServerFixtureFun = AsyncGenerator[tuple[asyncssh.SSHAcceptor, int], None]
 
 
-
-
 @dataclass
 class Client:
     """Mock client."""
@@ -37,13 +36,21 @@ class ClientKey:
 class AddClientFun(Protocol):
     """Add client function."""
 
-    def __call__(self, name: str, secret_names: list[str] | None = None, policies: list[str] | None = None) -> Awaitable[str]: ...
+    def __call__(
+        self,
+        name: str,
+        secret_names: list[str] | None = None,
+        policies: list[str] | None = None,
+    ) -> Awaitable[str]: ...
+
 
 class ProcessRunner(Protocol):
     """Process runner typing."""
 
-    def __call__(self, name: str, command: str, client: str | None = None) -> AsyncContextManager[asyncssh.SSHClientProcess[Any]]:
-        ...
+    def __call__(
+        self, name: str, command: str, client: str | None = None
+    ) -> AsyncContextManager[asyncssh.SSHClientProcess[Any]]: ...
+
 
 class ClientRegistry(TypedDict):
     """Client registry typing."""