diff --git a/.github/scripts/get_latest_changelog.py b/.github/scripts/get_latest_changelog.py
index c6a7d33c..83e0807d 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 d5dc7922..63787a59 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 433a7699..62670fa9 100644
--- a/requirements-testing.txt
+++ b/requirements-testing.txt
@@ -1,12 +1,14 @@
 coverage[toml] == 7.*
 coverage-conditional-plugin == 0.9.0
-pytest == 9.0.*; python_version >= '3.10'
+pytest == 9.1.*; python_version >= '3.10'
 pytest == 8.4.*; python_version < '3.10'
 pytest-cov == 7.1.*
 pytest-timeout == 2.4.*
 pytest-xdist == 3.8.*
-black == 25.*
+black == 26.*; python_version >= '3.10'
+black == 25.*; python_version < '3.10'
 ruff == 0.15.*
-mypy == 1.19.*
+mypy == 2.1.*; python_version >= '3.10'
+mypy == 1.19.*; python_version < '3.10'
 psutil == 7.2.*
 types-PyYAML ~= 6.0
diff --git a/src/openjd/adaptor_runtime/_background/backend_named_pipe_server.py b/src/openjd/adaptor_runtime/_background/backend_named_pipe_server.py
index 2b7c9c7d..830731da 100644
--- a/src/openjd/adaptor_runtime/_background/backend_named_pipe_server.py
+++ b/src/openjd/adaptor_runtime/_background/backend_named_pipe_server.py
@@ -17,7 +17,6 @@
 from ..adaptors import AdaptorRunner
 from .log_buffers import LogBuffer
 
-
 _logger = logging.getLogger(__name__)
 
 
diff --git a/src/openjd/adaptor_runtime/_named_pipe/named_pipe_request_handler.py b/src/openjd/adaptor_runtime/_named_pipe/named_pipe_request_handler.py
index 742850d8..cfb0b413 100644
--- a/src/openjd/adaptor_runtime/_named_pipe/named_pipe_request_handler.py
+++ b/src/openjd/adaptor_runtime/_named_pipe/named_pipe_request_handler.py
@@ -20,7 +20,6 @@
 
 from openjd.adaptor_runtime._osname import OSName
 
-
 _logger = logging.getLogger(__name__)
 
 
diff --git a/src/openjd/adaptor_runtime/_named_pipe/named_pipe_server.py b/src/openjd/adaptor_runtime/_named_pipe/named_pipe_server.py
index 5ba430a4..3e58ccb8 100644
--- a/src/openjd/adaptor_runtime/_named_pipe/named_pipe_server.py
+++ b/src/openjd/adaptor_runtime/_named_pipe/named_pipe_server.py
@@ -32,7 +32,6 @@
 
 from abc import ABC, abstractmethod
 
-
 _logger = logging.getLogger(__name__)
 
 
diff --git a/src/openjd/adaptor_runtime/adaptors/_validator.py b/src/openjd/adaptor_runtime/adaptors/_validator.py
index 7f292e49..d94d9938 100644
--- a/src/openjd/adaptor_runtime/adaptors/_validator.py
+++ b/src/openjd/adaptor_runtime/adaptors/_validator.py
@@ -9,7 +9,6 @@
 import yaml
 from typing import Any
 
-
 _logger = logging.getLogger(__name__)
 
 
diff --git a/src/openjd/adaptor_runtime/process/_logging_subprocess.py b/src/openjd/adaptor_runtime/process/_logging_subprocess.py
index efabd5ab..0073c263 100644
--- a/src/openjd/adaptor_runtime/process/_logging_subprocess.py
+++ b/src/openjd/adaptor_runtime/process/_logging_subprocess.py
@@ -1,6 +1,7 @@
 # Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 
 """Module for the LoggingSubprocess class"""
+
 from __future__ import annotations
 
 import logging
diff --git a/src/openjd/adaptor_runtime/process/_managed_process.py b/src/openjd/adaptor_runtime/process/_managed_process.py
index b27b79e9..cc4554ec 100644
--- a/src/openjd/adaptor_runtime/process/_managed_process.py
+++ b/src/openjd/adaptor_runtime/process/_managed_process.py
@@ -1,6 +1,7 @@
 # Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 
 """Module for the ManagedProcess class"""
+
 from __future__ import annotations
 
 from abc import ABC as ABC, abstractmethod
diff --git a/src/openjd/adaptor_runtime/process/_stream_logger.py b/src/openjd/adaptor_runtime/process/_stream_logger.py
index 86271062..5914e0e3 100644
--- a/src/openjd/adaptor_runtime/process/_stream_logger.py
+++ b/src/openjd/adaptor_runtime/process/_stream_logger.py
@@ -1,6 +1,7 @@
 # Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 
 """Module for the StreamLogger class"""
+
 from __future__ import annotations
 
 import logging
diff --git a/src/openjd/adaptor_runtime_client/posix_client_interface.py b/src/openjd/adaptor_runtime_client/posix_client_interface.py
index 91a51434..46f61f72 100644
--- a/src/openjd/adaptor_runtime_client/posix_client_interface.py
+++ b/src/openjd/adaptor_runtime_client/posix_client_interface.py
@@ -13,7 +13,6 @@
 from .connection import UnixHTTPConnection as _UnixHTTPConnection
 from urllib.parse import urlencode as _urlencode
 
-
 # Set timeout to None so our requests are blocking calls with no timeout.
 # See socket.settimeout
 _REQUEST_TIMEOUT = None
diff --git a/test/openjd/adaptor_runtime/unit/process/test_logging_subprocess.py b/test/openjd/adaptor_runtime/unit/process/test_logging_subprocess.py
index 87ea6c07..8c81d3aa 100644
--- a/test/openjd/adaptor_runtime/unit/process/test_logging_subprocess.py
+++ b/test/openjd/adaptor_runtime/unit/process/test_logging_subprocess.py
@@ -1,6 +1,7 @@
 # Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 
 """Tests for StreamLogger"""
+
 from __future__ import annotations
 
 import signal
diff --git a/test/openjd/adaptor_runtime/unit/process/test_stream_logger.py b/test/openjd/adaptor_runtime/unit/process/test_stream_logger.py
index 23ee1249..f578b1c0 100644
--- a/test/openjd/adaptor_runtime/unit/process/test_stream_logger.py
+++ b/test/openjd/adaptor_runtime/unit/process/test_stream_logger.py
@@ -1,6 +1,7 @@
 # Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 
 """Tests for LoggingSubprocess"""
+
 from __future__ import annotations
 
 import logging
diff --git a/test/openjd/adaptor_runtime/unit/test_entrypoint.py b/test/openjd/adaptor_runtime/unit/test_entrypoint.py
index d253f4ca..cb226f51 100644
--- a/test/openjd/adaptor_runtime/unit/test_entrypoint.py
+++ b/test/openjd/adaptor_runtime/unit/test_entrypoint.py
@@ -54,7 +54,11 @@ def mock_logging():
 
 @pytest.fixture(autouse=True)
 def mock_getLogger():
-    with patch.object(runtime_entrypoint.logging, "getLogger"):
+    # Patch EntryPoint._init_loggers (rather than the global logging.getLogger)
+    # so EntryPoint does not attach real handlers during tests. Patching
+    # logging.getLogger globally breaks pytest's caplog fixture on pytest >= 9.1,
+    # which relies on logging.getLogger to install its log-capture handler.
+    with patch.object(runtime_entrypoint.EntryPoint, "_init_loggers"):
         yield