diff --git a/.github/scripts/get_latest_changelog.py b/.github/scripts/get_latest_changelog.py
index 5616efbc..2382f587 100644
--- a/.github/scripts/get_latest_changelog.py
+++ b/.github/scripts/get_latest_changelog.py
@@ -29,6 +29,7 @@
 
 ```
 """
+
 import re
 
 h2 = r"^##\s.*$"
diff --git a/hatch_version_hook.py b/hatch_version_hook.py
index 6b65893b..73648f46 100644
--- a/hatch_version_hook.py
+++ b/hatch_version_hook.py
@@ -7,7 +7,6 @@
 from hatchling.builders.hooks.plugin.interface import BuildHookInterface
 from typing import Any, Optional
 
-
 _logger = logging.Logger(__name__, logging.INFO)
 _stdout_handler = logging.StreamHandler(sys.stdout)
 _stdout_handler.addFilter(lambda record: record.levelno <= logging.INFO)
diff --git a/requirements-testing.txt b/requirements-testing.txt
index 8ce61eaa..35888c77 100644
--- a/requirements-testing.txt
+++ b/requirements-testing.txt
@@ -5,7 +5,8 @@ pytest == 9.1.*; python_version >= "3.10"
 pytest-cov == 7.1.*
 pytest-timeout == 2.4.*
 pytest-xdist == 3.8.*
-black == 25.*
+black == 25.*; python_version == "3.9"
+black == 26.*; python_version >= "3.10"
 ruff == 0.15.*
 psutil >= 5.9,< 7.3
 mypy == 1.19.*; python_version == "3.9"
diff --git a/scripts/windows_service_test.py b/scripts/windows_service_test.py
index 0dc8ff2c..3d230e8c 100644
--- a/scripts/windows_service_test.py
+++ b/scripts/windows_service_test.py
@@ -17,7 +17,6 @@
 import pytest
 from getpass import getpass
 
-
 logger = logging.getLogger(__name__)
 
 
diff --git a/src/openjd/sessions/_linux/_capabilities.py b/src/openjd/sessions/_linux/_capabilities.py
index 0a7983a1..c2c31a58 100644
--- a/src/openjd/sessions/_linux/_capabilities.py
+++ b/src/openjd/sessions/_linux/_capabilities.py
@@ -19,7 +19,6 @@
 
 from .._logging import LOG
 
-
 # Capability sets
 CAP_EFFECTIVE = 0
 CAP_PERMITTED = 1
diff --git a/src/openjd/sessions/_v1/_linux/_capabilities.py b/src/openjd/sessions/_v1/_linux/_capabilities.py
index 0a7983a1..c2c31a58 100644
--- a/src/openjd/sessions/_v1/_linux/_capabilities.py
+++ b/src/openjd/sessions/_v1/_linux/_capabilities.py
@@ -19,7 +19,6 @@
 
 from .._logging import LOG
 
-
 # Capability sets
 CAP_EFFECTIVE = 0
 CAP_PERMITTED = 1
diff --git a/test/openjd/sessions_v0/test_subprocess.py b/test/openjd/sessions_v0/test_subprocess.py
index 5f38d7ac..6c014546 100644
--- a/test/openjd/sessions_v0/test_subprocess.py
+++ b/test/openjd/sessions_v0/test_subprocess.py
@@ -1,6 +1,7 @@
 # Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 
 """Tests for LoggingSubprocess"""
+
 import sys
 import tempfile
 import time
diff --git a/test/openjd/sessions_v1/test_pickle.py b/test/openjd/sessions_v1/test_pickle.py
index fa7c483d..d6c63aac 100644
--- a/test/openjd/sessions_v1/test_pickle.py
+++ b/test/openjd/sessions_v1/test_pickle.py
@@ -19,7 +19,6 @@
 
 import pytest
 
-
 # ── Group A: enums ───────────────────────────────────────────────
 
 
diff --git a/test/openjd/sessions_v1/test_session_scenarios.py b/test/openjd/sessions_v1/test_session_scenarios.py
index 839df7f3..2459580b 100644
--- a/test/openjd/sessions_v1/test_session_scenarios.py
+++ b/test/openjd/sessions_v1/test_session_scenarios.py
@@ -74,7 +74,6 @@
 )
 from openjd.sessions._v1 import Session, PathMappingRule, SessionState
 
-
 SCENARIOS_DIR = Path(__file__).parent / "scenarios"