diff --git a/google/cloud/alloydb/connector/async_connector.py b/google/cloud/alloydb/connector/async_connector.py
index 0086bb04..349b8803 100644
--- a/google/cloud/alloydb/connector/async_connector.py
+++ b/google/cloud/alloydb/connector/async_connector.py
@@ -212,9 +212,7 @@ async def _remove_cached(self, instance_uri: str) -> None:
         """Stops all background refreshes and deletes the connection
         info cache from the map of caches.
         """
-        logger.debug(
-            f"['{instance_uri}']: Removing connection info from cache"
-        )
+        logger.debug(f"['{instance_uri}']: Removing connection info from cache")
         # remove cache from stored caches and close it
         cache = self._cache.pop(instance_uri)
         await cache.close()
diff --git a/google/cloud/alloydb/connector/connector.py b/google/cloud/alloydb/connector/connector.py
index 25047ba0..c833f628 100644
--- a/google/cloud/alloydb/connector/connector.py
+++ b/google/cloud/alloydb/connector/connector.py
@@ -344,9 +344,7 @@ async def _remove_cached(self, instance_uri: str) -> None:
         """Stops all background refreshes and deletes the connection
         info cache from the map of caches.
         """
-        logger.debug(
-            f"['{instance_uri}']: Removing connection info from cache"
-        )
+        logger.debug(f"['{instance_uri}']: Removing connection info from cache")
         # remove cache from stored caches and close it
         cache = self._cache.pop(instance_uri)
         await cache.close()
diff --git a/tests/unit/mocks.py b/tests/unit/mocks.py
index b35b14ed..e9074f35 100644
--- a/tests/unit/mocks.py
+++ b/tests/unit/mocks.py
@@ -210,12 +210,16 @@ def __init__(
 
         i = FakeInstance()
         # The instances that currently exist and the client can send API requests to.
-        self.existing_instances = [f"projects/{i.project}/locations/{i.region}/clusters/{i.cluster}/instances/{i.name}"]
+        self.existing_instances = [
+            f"projects/{i.project}/locations/{i.region}/clusters/{i.cluster}/instances/{i.name}"
+        ]
 
     async def _get_metadata(self, *args: Any, **kwargs: Any) -> str:
         instance_uri = f"projects/{self.instance.project}/locations/{self.instance.region}/clusters/{self.instance.cluster}/instances/{self.instance.name}"
         if instance_uri not in self.existing_instances:
-            raise ClientResponseError(RequestInfo(url = instance_uri, method = "GET", headers = None), 404)
+            raise ClientResponseError(
+                RequestInfo(url=instance_uri, method="GET", headers=None), 404
+            )
         return self.instance.ip_addrs
 
     async def _get_client_certificate(
@@ -227,7 +231,9 @@ async def _get_client_certificate(
     ) -> Tuple[str, List[str]]:
         instance_uri = f"projects/{self.instance.project}/locations/{self.instance.region}/clusters/{self.instance.cluster}/instances/{self.instance.name}"
         if instance_uri not in self.existing_instances:
-            raise ClientResponseError(RequestInfo(url = instance_uri, method = "POST", headers = None), 404)
+            raise ClientResponseError(
+                RequestInfo(url=instance_uri, method="POST", headers=None), 404
+            )
         root_cert, intermediate_cert, server_cert = self.instance.get_pem_certs()
         # encode public key to bytes
         pub_key_bytes: rsa.RSAPublicKey = serialization.load_pem_public_key(
diff --git a/tests/unit/test_async_connector.py b/tests/unit/test_async_connector.py
index 2db0b94c..2649be43 100644
--- a/tests/unit/test_async_connector.py
+++ b/tests/unit/test_async_connector.py
@@ -299,7 +299,10 @@ async def test_async_connect_bad_ip_type(
             == f"Incorrect value for ip_type, got '{bad_ip_type}'. Want one of: 'PUBLIC', 'PRIVATE', 'PSC'."
         )
 
-async def test_Connector_remove_cached_bad_instance(credentials: FakeCredentials) -> None:
+
+async def test_Connector_remove_cached_bad_instance(
+    credentials: FakeCredentials,
+) -> None:
     """When a Connector attempts to retrieve connection info for a
     non-existent instance, it should delete the instance from
     the cache and ensure no background refresh happens (which would be
@@ -307,7 +310,9 @@ async def test_Connector_remove_cached_bad_instance(credentials: FakeCredentials
     """
     instance_uri = "projects/test-project/locations/test-region/clusters/test-cluster/instances/bad-test-instance"
     async with AsyncConnector(credentials=credentials) as connector:
-        connector._client = FakeAlloyDBClient(instance = FakeInstance(name = "bad-test-instance"))
+        connector._client = FakeAlloyDBClient(
+            instance=FakeInstance(name="bad-test-instance")
+        )
         cache = RefreshAheadCache(instance_uri, connector._client, connector._keys)
         connector._cache[instance_uri] = cache
         with pytest.raises(ClientResponseError):
diff --git a/tests/unit/test_connector.py b/tests/unit/test_connector.py
index 603b67db..65ef8a78 100644
--- a/tests/unit/test_connector.py
+++ b/tests/unit/test_connector.py
@@ -210,7 +210,9 @@ def test_Connector_close_called_multiple_times(credentials: FakeCredentials) ->
     connector.close()
 
 
-async def test_Connector_remove_cached_bad_instance(credentials: FakeCredentials) -> None:
+async def test_Connector_remove_cached_bad_instance(
+    credentials: FakeCredentials,
+) -> None:
     """When a Connector attempts to retrieve connection info for a
     non-existent instance, it should delete the instance from
     the cache and ensure no background refresh happens (which would be
@@ -218,7 +220,9 @@ async def test_Connector_remove_cached_bad_instance(credentials: FakeCredentials
     """
     instance_uri = "projects/test-project/locations/test-region/clusters/test-cluster/instances/bad-test-instance"
     with Connector(credentials) as connector:
-        connector._client = FakeAlloyDBClient(instance = FakeInstance(name = "bad-test-instance"))
+        connector._client = FakeAlloyDBClient(
+            instance=FakeInstance(name="bad-test-instance")
+        )
         cache = RefreshAheadCache(instance_uri, connector._client, connector._keys)
         connector._cache[instance_uri] = cache
         with pytest.raises(ClientResponseError):
@@ -249,4 +253,4 @@ async def test_Connector_remove_cached_no_ip_type(
         with pytest.raises(IPTypeNotFoundError):
             await connector.connect_async(instance_uri, "pg8000", ip_type="private")
         # check that cache has been removed from dict
-        assert instance_uri not in connector._cache
\ No newline at end of file
+        assert instance_uri not in connector._cache