diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 322fae72..0899b7ee 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -10,7 +10,7 @@ repos:
       - id: check-yaml
 
   - repo: https://github.com/psf/black
-    rev: 23.12.1
+    rev: 24.1.1
     hooks:
       - id: black
 
diff --git a/src/caselawclient/models/neutral_citation_mixin.py b/src/caselawclient/models/neutral_citation_mixin.py
index c800f78f..a33747ba 100644
--- a/src/caselawclient/models/neutral_citation_mixin.py
+++ b/src/caselawclient/models/neutral_citation_mixin.py
@@ -19,20 +19,21 @@ class NeutralCitationMixin:
     """
 
     def __init__(self, document_noun: str, *args: Any, **kwargs: Any) -> None:
-        self.attributes_to_validate: list[
-            tuple[str, bool, str]
-        ] = self.attributes_to_validate + [
-            (
-                "has_ncn",
-                True,
-                f"This {document_noun} has no neutral citation number",
-            ),
-            (
-                "has_valid_ncn",
-                True,
-                f"The neutral citation number of this {document_noun} is not valid",
-            ),
-        ]
+        self.attributes_to_validate: list[tuple[str, bool, str]] = (
+            self.attributes_to_validate
+            + [
+                (
+                    "has_ncn",
+                    True,
+                    f"This {document_noun} has no neutral citation number",
+                ),
+                (
+                    "has_valid_ncn",
+                    True,
+                    f"The neutral citation number of this {document_noun} is not valid",
+                ),
+            ]
+        )
 
         super(NeutralCitationMixin, self).__init__(*args, **kwargs)
 
diff --git a/src/caselawclient/models/utilities/aws.py b/src/caselawclient/models/utilities/aws.py
index 38d53fcb..5f7a06ad 100644
--- a/src/caselawclient/models/utilities/aws.py
+++ b/src/caselawclient/models/utilities/aws.py
@@ -30,13 +30,11 @@ class ParserInstructionsDict(TypedDict):
 
 
 @overload
-def create_aws_client(service: Literal["s3"]) -> S3Client:
-    ...
+def create_aws_client(service: Literal["s3"]) -> S3Client: ...
 
 
 @overload
-def create_aws_client(service: Literal["sns"]) -> SNSClient:
-    ...
+def create_aws_client(service: Literal["sns"]) -> SNSClient: ...
 
 
 def create_aws_client(service: Union[Literal["s3"], Literal["sns"]]) -> Any:
diff --git a/tests/models/test_documents.py b/tests/models/test_documents.py
index 0a020b77..75322eee 100644
--- a/tests/models/test_documents.py
+++ b/tests/models/test_documents.py
@@ -214,9 +214,9 @@ def test_document_versions_happy_case(self, mock_api_client):
             {"uri": "test/1234_xml_versions/2-1234.xml"},
             {"uri": "test/1234_xml_versions/1-1234.xml"},
         ]
-        version_document.versions_as_documents[
-            0
-        ].uri = "test/1234_xml_versions/2-1234.xml"
+        version_document.versions_as_documents[0].uri = (
+            "test/1234_xml_versions/2-1234.xml"
+        )
 
     def test_document_version_number_when_not_version(self, mock_api_client):
         base_document = Document("test/1234", mock_api_client)