diff --git a/diff_cover/command_runner.py b/diff_cover/command_runner.py
index fb1c4910..0761dc1b 100644
--- a/diff_cover/command_runner.py
+++ b/diff_cover/command_runner.py
@@ -31,9 +31,11 @@ def execute(command, exit_codes=None):
         sys.stderr.write(
             " ".join(
                 [
-                    cmd.decode(sys.getfilesystemencoding())
-                    if isinstance(cmd, bytes)
-                    else cmd
+                    (
+                        cmd.decode(sys.getfilesystemencoding())
+                        if isinstance(cmd, bytes)
+                        else cmd
+                    )
                     for cmd in command
                 ]
             )
diff --git a/diff_cover/diff_reporter.py b/diff_cover/diff_reporter.py
index e06f8ec0..a9404d40 100644
--- a/diff_cover/diff_reporter.py
+++ b/diff_cover/diff_reporter.py
@@ -1,6 +1,7 @@
 """
 Classes for querying which lines have changed based on a diff.
 """
+
 import fnmatch
 import glob
 import os
diff --git a/diff_cover/git_diff.py b/diff_cover/git_diff.py
index dff8ff4b..6dec1c24 100644
--- a/diff_cover/git_diff.py
+++ b/diff_cover/git_diff.py
@@ -1,6 +1,7 @@
 """
 Wrapper for `git diff` command.
 """
+
 from textwrap import dedent
 
 from diff_cover.command_runner import CommandError, execute
diff --git a/diff_cover/git_path.py b/diff_cover/git_path.py
index bad69494..fc21e8e8 100644
--- a/diff_cover/git_path.py
+++ b/diff_cover/git_path.py
@@ -1,6 +1,7 @@
 """
 Converter for `git diff` paths
 """
+
 import os
 import sys
 
diff --git a/diff_cover/report_generator.py b/diff_cover/report_generator.py
index fe6fd348..132f9d93 100644
--- a/diff_cover/report_generator.py
+++ b/diff_cover/report_generator.py
@@ -1,6 +1,7 @@
 """
 Classes for generating diff coverage reports.
 """
+
 import contextlib
 import json
 import os
diff --git a/diff_cover/snippets.py b/diff_cover/snippets.py
index 51255f93..c78e0104 100644
--- a/diff_cover/snippets.py
+++ b/diff_cover/snippets.py
@@ -2,6 +2,7 @@
 Load snippets from source files to show violation lines
 in HTML reports.
 """
+
 import contextlib
 from tokenize import open as openpy
 
diff --git a/poetry.lock b/poetry.lock
index 13970846..7b6d706d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -16,33 +16,33 @@ typing-extensions = {version = ">=4.0.0", markers = "python_version < \"3.11\""}
 
 [[package]]
 name = "black"
-version = "23.12.1"
+version = "24.1.1"
 description = "The uncompromising code formatter."
 optional = false
 python-versions = ">=3.8"
 files = [
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-    {file = "black-23.12.1-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:c88b3711d12905b74206227109272673edce0cb29f27e1385f33b0163c414bba"},
-    {file = "black-23.12.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:a920b569dc6b3472513ba6ddea21f440d4b4c699494d2e972a1753cdc25df7b0"},
-    {file = "black-23.12.1-cp310-cp310-win_amd64.whl", hash = "sha256:3fa4be75ef2a6b96ea8d92b1587dd8cb3a35c7e3d51f0738ced0781c3aa3a5a3"},
-    {file = "black-23.12.1-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:8d4df77958a622f9b5a4c96edb4b8c0034f8434032ab11077ec6c56ae9f384ba"},
-    {file = "black-23.12.1-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:602cfb1196dc692424c70b6507593a2b29aac0547c1be9a1d1365f0d964c353b"},
-    {file = "black-23.12.1-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:9c4352800f14be5b4864016882cdba10755bd50805c95f728011bcb47a4afd59"},
-    {file = "black-23.12.1-cp311-cp311-win_amd64.whl", hash = "sha256:0808494f2b2df923ffc5723ed3c7b096bd76341f6213989759287611e9837d50"},
-    {file = "black-23.12.1-cp312-cp312-macosx_10_9_x86_64.whl", hash = "sha256:25e57fd232a6d6ff3f4478a6fd0580838e47c93c83eaf1ccc92d4faf27112c4e"},
-    {file = "black-23.12.1-cp312-cp312-macosx_11_0_arm64.whl", hash = "sha256:2d9e13db441c509a3763a7a3d9a49ccc1b4e974a47be4e08ade2a228876500ec"},
-    {file = "black-23.12.1-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:6d1bd9c210f8b109b1762ec9fd36592fdd528485aadb3f5849b2740ef17e674e"},
-    {file = "black-23.12.1-cp312-cp312-win_amd64.whl", hash = "sha256:ae76c22bde5cbb6bfd211ec343ded2163bba7883c7bc77f6b756a1049436fbb9"},
-    {file = "black-23.12.1-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:1fa88a0f74e50e4487477bc0bb900c6781dbddfdfa32691e780bf854c3b4a47f"},
-    {file = "black-23.12.1-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:a4d6a9668e45ad99d2f8ec70d5c8c04ef4f32f648ef39048d010b0689832ec6d"},
-    {file = "black-23.12.1-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:b18fb2ae6c4bb63eebe5be6bd869ba2f14fd0259bda7d18a46b764d8fb86298a"},
-    {file = "black-23.12.1-cp38-cp38-win_amd64.whl", hash = "sha256:c04b6d9d20e9c13f43eee8ea87d44156b8505ca8a3c878773f68b4e4812a421e"},
-    {file = "black-23.12.1-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:3e1b38b3135fd4c025c28c55ddfc236b05af657828a8a6abe5deec419a0b7055"},
-    {file = "black-23.12.1-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:4f0031eaa7b921db76decd73636ef3a12c942ed367d8c3841a0739412b260a54"},
-    {file = "black-23.12.1-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:97e56155c6b737854e60a9ab1c598ff2533d57e7506d97af5481141671abf3ea"},
-    {file = "black-23.12.1-cp39-cp39-win_amd64.whl", hash = "sha256:dd15245c8b68fe2b6bd0f32c1556509d11bb33aec9b5d0866dd8e2ed3dba09c2"},
-    {file = "black-23.12.1-py3-none-any.whl", hash = "sha256:78baad24af0f033958cad29731e27363183e140962595def56423e626f4bee3e"},
-    {file = "black-23.12.1.tar.gz", hash = "sha256:4ce3ef14ebe8d9509188014d96af1c456a910d5b5cbf434a09fef7e024b3d0d5"},
+    {file = "black-24.1.1-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:2588021038bd5ada078de606f2a804cadd0a3cc6a79cb3e9bb3a8bf581325a4c"},
+    {file = "black-24.1.1-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:1a95915c98d6e32ca43809d46d932e2abc5f1f7d582ffbe65a5b4d1588af7445"},
+    {file = "black-24.1.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:2fa6a0e965779c8f2afb286f9ef798df770ba2b6cee063c650b96adec22c056a"},
+    {file = "black-24.1.1-cp310-cp310-win_amd64.whl", hash = "sha256:5242ecd9e990aeb995b6d03dc3b2d112d4a78f2083e5a8e86d566340ae80fec4"},
+    {file = "black-24.1.1-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:fc1ec9aa6f4d98d022101e015261c056ddebe3da6a8ccfc2c792cbe0349d48b7"},
+    {file = "black-24.1.1-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:0269dfdea12442022e88043d2910429bed717b2d04523867a85dacce535916b8"},
+    {file = "black-24.1.1-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:b3d64db762eae4a5ce04b6e3dd745dcca0fb9560eb931a5be97472e38652a161"},
+    {file = "black-24.1.1-cp311-cp311-win_amd64.whl", hash = "sha256:5d7b06ea8816cbd4becfe5f70accae953c53c0e53aa98730ceccb0395520ee5d"},
+    {file = "black-24.1.1-cp312-cp312-macosx_10_9_x86_64.whl", hash = "sha256:e2c8dfa14677f90d976f68e0c923947ae68fa3961d61ee30976c388adc0b02c8"},
+    {file = "black-24.1.1-cp312-cp312-macosx_11_0_arm64.whl", hash = "sha256:a21725862d0e855ae05da1dd25e3825ed712eaaccef6b03017fe0853a01aa45e"},
+    {file = "black-24.1.1-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:07204d078e25327aad9ed2c64790d681238686bce254c910de640c7cc4fc3aa6"},
+    {file = "black-24.1.1-cp312-cp312-win_amd64.whl", hash = "sha256:a83fe522d9698d8f9a101b860b1ee154c1d25f8a82ceb807d319f085b2627c5b"},
+    {file = "black-24.1.1-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:08b34e85170d368c37ca7bf81cf67ac863c9d1963b2c1780c39102187ec8dd62"},
+    {file = "black-24.1.1-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:7258c27115c1e3b5de9ac6c4f9957e3ee2c02c0b39222a24dc7aa03ba0e986f5"},
+    {file = "black-24.1.1-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:40657e1b78212d582a0edecafef133cf1dd02e6677f539b669db4746150d38f6"},
+    {file = "black-24.1.1-cp38-cp38-win_amd64.whl", hash = "sha256:e298d588744efda02379521a19639ebcd314fba7a49be22136204d7ed1782717"},
+    {file = "black-24.1.1-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:34afe9da5056aa123b8bfda1664bfe6fb4e9c6f311d8e4a6eb089da9a9173bf9"},
+    {file = "black-24.1.1-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:854c06fb86fd854140f37fb24dbf10621f5dab9e3b0c29a690ba595e3d543024"},
+    {file = "black-24.1.1-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:3897ae5a21ca132efa219c029cce5e6bfc9c3d34ed7e892113d199c0b1b444a2"},
+    {file = "black-24.1.1-cp39-cp39-win_amd64.whl", hash = "sha256:ecba2a15dfb2d97105be74bbfe5128bc5e9fa8477d8c46766505c1dda5883aac"},
+    {file = "black-24.1.1-py3-none-any.whl", hash = "sha256:5cdc2e2195212208fbcae579b931407c1fa9997584f0a415421748aeafff1168"},
+    {file = "black-24.1.1.tar.gz", hash = "sha256:48b5760dcbfe5cf97fd4fba23946681f3a81514c6ab8a45b50da67ac8fbc6c7b"},
 ]
 
 [package.dependencies]
@@ -679,4 +679,4 @@ toml = ["tomli"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.8.10"
-content-hash = "72d6aa4d189942e54c4ab56f2e1c44779c5276127df7122e46b8b0ed0dc0bbed"
+content-hash = "d96b91008ec2cb34f4014c3723a337a5120fcb60a337f90f87f50185d2ef550e"
diff --git a/pyproject.toml b/pyproject.toml
index 551be756..f23a7304 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -58,7 +58,7 @@ pyflakes = "^2.5.0"
 pylint = "^3.0.3"
 pylint-pytest = "^1.1.7"
 pydocstyle = "^6.1.1"
-black = "^23.12.1"
+black = "^24.1.1"
 isort = "^5.13.2"
 doc8 = "1.1.1"
 
diff --git a/tests/helpers.py b/tests/helpers.py
index 9adf612d..69211477 100644
--- a/tests/helpers.py
+++ b/tests/helpers.py
@@ -1,6 +1,7 @@
 """
 Test helper functions.
 """
+
 import os.path
 import random