diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
index f09b08660e7..f39564897ec 100644
--- a/.git-blame-ignore-revs
+++ b/.git-blame-ignore-revs
@@ -34,3 +34,4 @@ c7ee560e00b85f7486b452c14ff49e4737996eda  # Blacken tools/
 94999255d5ede440c37137d210666fdf64302e75  # Reformat the codebase, with black
 585037a80a1177f1fa92e159a7079855782e543e  # Cleanup implicit string concatenation
 8a6f6ac19b80a6dc35900a47016c851d9fcd2ee2  # Blacken src/pip/_internal/resolution directory
+acfcae8941bb12ecfc372a05c875a7b414992604  # Reformat with Black's 2025 code style
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index ebbd323b389..279884b1446 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -17,7 +17,7 @@ repos:
     exclude: .patch
 
 - repo: https://github.com/psf/black-pre-commit-mirror
-  rev: 24.10.0
+  rev: 25.1.0
   hooks:
   - id: black
 
diff --git a/news/13156.bugfix.rst b/news/13156.bugfix.rst
new file mode 100644
index 00000000000..e0553030070
--- /dev/null
+++ b/news/13156.bugfix.rst
@@ -0,0 +1 @@
+Show the correct path to the interpreter also when it's a symlink in a venv in the pip upgrade prompt.
diff --git a/news/13186.bugfix.rst b/news/13186.bugfix.rst
new file mode 100644
index 00000000000..0c60275d2b8
--- /dev/null
+++ b/news/13186.bugfix.rst
@@ -0,0 +1 @@
+Fix regression where truststore would never be used while installing build dependencies.
diff --git a/noxfile.py b/noxfile.py
index 70e24a01142..80c7358e034 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -1,5 +1,4 @@
-"""Automation using nox.
-"""
+"""Automation using nox."""
 
 import argparse
 import glob
diff --git a/src/pip/_internal/build_env.py b/src/pip/_internal/build_env.py
index e820dc3d5fb..2612d4d14e8 100644
--- a/src/pip/_internal/build_env.py
+++ b/src/pip/_internal/build_env.py
@@ -1,5 +1,4 @@
-"""Build Environment used for isolation during sdist building
-"""
+"""Build Environment used for isolation during sdist building"""
 
 import logging
 import os
@@ -11,7 +10,6 @@
 from types import TracebackType
 from typing import TYPE_CHECKING, Iterable, List, Optional, Set, Tuple, Type, Union
 
-from pip._vendor.certifi import where
 from pip._vendor.packaging.version import Version
 
 from pip import __file__ as pip_location
@@ -246,8 +244,6 @@ def _install_requirements(
             # target from config file or env var should be ignored
             "--target",
             "",
-            "--cert",
-            finder.custom_cert or where(),
         ]
         if logger.getEffectiveLevel() <= logging.DEBUG:
             args.append("-vv")
@@ -276,6 +272,8 @@ def _install_requirements(
             args.extend(["--proxy", finder.proxy])
         for host in finder.trusted_hosts:
             args.extend(["--trusted-host", host])
+        if finder.custom_cert:
+            args.extend(["--cert", finder.custom_cert])
         if finder.client_cert:
             args.extend(["--client-cert", finder.client_cert])
         if finder.allow_all_prereleases:
diff --git a/src/pip/_internal/cache.py b/src/pip/_internal/cache.py
index 6b4512672db..97d917193d3 100644
--- a/src/pip/_internal/cache.py
+++ b/src/pip/_internal/cache.py
@@ -1,5 +1,4 @@
-"""Cache Management
-"""
+"""Cache Management"""
 
 import hashlib
 import json
diff --git a/src/pip/_internal/cli/__init__.py b/src/pip/_internal/cli/__init__.py
index e589bb917e2..5fcddf5d81e 100644
--- a/src/pip/_internal/cli/__init__.py
+++ b/src/pip/_internal/cli/__init__.py
@@ -1,4 +1,3 @@
-"""Subpackage containing all of pip's command line interface related code
-"""
+"""Subpackage containing all of pip's command line interface related code"""
 
 # This file intentionally does not import submodules
diff --git a/src/pip/_internal/cli/autocompletion.py b/src/pip/_internal/cli/autocompletion.py
index f3f70ac8553..4fa461293c7 100644
--- a/src/pip/_internal/cli/autocompletion.py
+++ b/src/pip/_internal/cli/autocompletion.py
@@ -1,5 +1,4 @@
-"""Logic that powers autocompletion installed by ``pip completion``.
-"""
+"""Logic that powers autocompletion installed by ``pip completion``."""
 
 import optparse
 import os
diff --git a/src/pip/_internal/cli/main.py b/src/pip/_internal/cli/main.py
index 563ac79c984..377476c18c3 100644
--- a/src/pip/_internal/cli/main.py
+++ b/src/pip/_internal/cli/main.py
@@ -1,5 +1,4 @@
-"""Primary application entrypoint.
-"""
+"""Primary application entrypoint."""
 
 import locale
 import logging
diff --git a/src/pip/_internal/cli/main_parser.py b/src/pip/_internal/cli/main_parser.py
index 5ade356b9c2..c52684a81fe 100644
--- a/src/pip/_internal/cli/main_parser.py
+++ b/src/pip/_internal/cli/main_parser.py
@@ -1,5 +1,4 @@
-"""A single place for constructing and exposing the main parser
-"""
+"""A single place for constructing and exposing the main parser"""
 
 import os
 import subprocess
diff --git a/src/pip/_internal/index/__init__.py b/src/pip/_internal/index/__init__.py
index 7a17b7b3b6a..197dd757de9 100644
--- a/src/pip/_internal/index/__init__.py
+++ b/src/pip/_internal/index/__init__.py
@@ -1,2 +1 @@
-"""Index interaction code
-"""
+"""Index interaction code"""
diff --git a/src/pip/_internal/models/__init__.py b/src/pip/_internal/models/__init__.py
index 7855226e4b5..7b1fc295032 100644
--- a/src/pip/_internal/models/__init__.py
+++ b/src/pip/_internal/models/__init__.py
@@ -1,2 +1 @@
-"""A package that contains models that represent entities.
-"""
+"""A package that contains models that represent entities."""
diff --git a/src/pip/_internal/models/direct_url.py b/src/pip/_internal/models/direct_url.py
index fc5ec8d4aa9..8f990dd0ca1 100644
--- a/src/pip/_internal/models/direct_url.py
+++ b/src/pip/_internal/models/direct_url.py
@@ -1,4 +1,4 @@
-""" PEP 610 """
+"""PEP 610"""
 
 import json
 import re
diff --git a/src/pip/_internal/network/__init__.py b/src/pip/_internal/network/__init__.py
index b51bde91b2e..0ae1f5626bc 100644
--- a/src/pip/_internal/network/__init__.py
+++ b/src/pip/_internal/network/__init__.py
@@ -1,2 +1 @@
-"""Contains purely network-related utilities.
-"""
+"""Contains purely network-related utilities."""
diff --git a/src/pip/_internal/network/cache.py b/src/pip/_internal/network/cache.py
index fca04e6945f..2fe00f40263 100644
--- a/src/pip/_internal/network/cache.py
+++ b/src/pip/_internal/network/cache.py
@@ -1,5 +1,4 @@
-"""HTTP cache implementation.
-"""
+"""HTTP cache implementation."""
 
 import os
 from contextlib import contextmanager
diff --git a/src/pip/_internal/network/download.py b/src/pip/_internal/network/download.py
index 5c3bce3d2fd..9c6d7016579 100644
--- a/src/pip/_internal/network/download.py
+++ b/src/pip/_internal/network/download.py
@@ -1,5 +1,4 @@
-"""Download files with progress indicators.
-"""
+"""Download files with progress indicators."""
 
 import email.message
 import logging
diff --git a/src/pip/_internal/network/xmlrpc.py b/src/pip/_internal/network/xmlrpc.py
index 22ec8d2f4a6..ba5caf337e2 100644
--- a/src/pip/_internal/network/xmlrpc.py
+++ b/src/pip/_internal/network/xmlrpc.py
@@ -1,5 +1,4 @@
-"""xmlrpclib.Transport implementation
-"""
+"""xmlrpclib.Transport implementation"""
 
 import logging
 import urllib.parse
diff --git a/src/pip/_internal/operations/build/metadata.py b/src/pip/_internal/operations/build/metadata.py
index c66ac354deb..a546809ecd5 100644
--- a/src/pip/_internal/operations/build/metadata.py
+++ b/src/pip/_internal/operations/build/metadata.py
@@ -1,5 +1,4 @@
-"""Metadata generation logic for source distributions.
-"""
+"""Metadata generation logic for source distributions."""
 
 import os
 
diff --git a/src/pip/_internal/operations/build/metadata_editable.py b/src/pip/_internal/operations/build/metadata_editable.py
index 3397ccf0f92..27ecd7d3d80 100644
--- a/src/pip/_internal/operations/build/metadata_editable.py
+++ b/src/pip/_internal/operations/build/metadata_editable.py
@@ -1,5 +1,4 @@
-"""Metadata generation logic for source distributions.
-"""
+"""Metadata generation logic for source distributions."""
 
 import os
 
diff --git a/src/pip/_internal/operations/build/metadata_legacy.py b/src/pip/_internal/operations/build/metadata_legacy.py
index c01dd1c678a..e385b5ddf76 100644
--- a/src/pip/_internal/operations/build/metadata_legacy.py
+++ b/src/pip/_internal/operations/build/metadata_legacy.py
@@ -1,5 +1,4 @@
-"""Metadata generation logic for legacy source distributions.
-"""
+"""Metadata generation logic for legacy source distributions."""
 
 import logging
 import os
diff --git a/src/pip/_internal/operations/check.py b/src/pip/_internal/operations/check.py
index 4b6fbc4c375..c6d676d6e61 100644
--- a/src/pip/_internal/operations/check.py
+++ b/src/pip/_internal/operations/check.py
@@ -1,5 +1,4 @@
-"""Validation of dependencies of packages
-"""
+"""Validation of dependencies of packages"""
 
 import logging
 from contextlib import suppress
diff --git a/src/pip/_internal/operations/install/__init__.py b/src/pip/_internal/operations/install/__init__.py
index 24d6a5dd31f..2645a4acad0 100644
--- a/src/pip/_internal/operations/install/__init__.py
+++ b/src/pip/_internal/operations/install/__init__.py
@@ -1,2 +1 @@
-"""For modules related to installing packages.
-"""
+"""For modules related to installing packages."""
diff --git a/src/pip/_internal/operations/install/editable_legacy.py b/src/pip/_internal/operations/install/editable_legacy.py
index 9aaa699a645..644bcec111f 100644
--- a/src/pip/_internal/operations/install/editable_legacy.py
+++ b/src/pip/_internal/operations/install/editable_legacy.py
@@ -1,5 +1,4 @@
-"""Legacy editable installation process, i.e. `setup.py develop`.
-"""
+"""Legacy editable installation process, i.e. `setup.py develop`."""
 
 import logging
 from typing import Optional, Sequence
diff --git a/src/pip/_internal/operations/install/wheel.py b/src/pip/_internal/operations/install/wheel.py
index aef42aa9eef..769c433d043 100644
--- a/src/pip/_internal/operations/install/wheel.py
+++ b/src/pip/_internal/operations/install/wheel.py
@@ -1,5 +1,4 @@
-"""Support for installing and building the "wheel" binary package format.
-"""
+"""Support for installing and building the "wheel" binary package format."""
 
 import collections
 import compileall
diff --git a/src/pip/_internal/operations/prepare.py b/src/pip/_internal/operations/prepare.py
index e6aa3447200..a1c02d7dba9 100644
--- a/src/pip/_internal/operations/prepare.py
+++ b/src/pip/_internal/operations/prepare.py
@@ -1,5 +1,4 @@
-"""Prepares a distribution for installation
-"""
+"""Prepares a distribution for installation"""
 
 # The following comment should be removed at some point in the future.
 # mypy: strict-optional=False
diff --git a/src/pip/_internal/req/req_uninstall.py b/src/pip/_internal/req/req_uninstall.py
index 26df20844b3..e48c53eb1e4 100644
--- a/src/pip/_internal/req/req_uninstall.py
+++ b/src/pip/_internal/req/req_uninstall.py
@@ -38,7 +38,7 @@ def _script_names(
 
 
 def _unique(
-    fn: Callable[..., Generator[Any, None, None]]
+    fn: Callable[..., Generator[Any, None, None]],
 ) -> Callable[..., Generator[Any, None, None]]:
     @functools.wraps(fn)
     def unique(*args: Any, **kw: Any) -> Generator[Any, None, None]:
diff --git a/src/pip/_internal/utils/compatibility_tags.py b/src/pip/_internal/utils/compatibility_tags.py
index 2e7b7450dce..43d6a4aa4bd 100644
--- a/src/pip/_internal/utils/compatibility_tags.py
+++ b/src/pip/_internal/utils/compatibility_tags.py
@@ -1,5 +1,4 @@
-"""Generate and work with PEP 425 Compatibility Tags.
-"""
+"""Generate and work with PEP 425 Compatibility Tags."""
 
 import re
 from typing import List, Optional, Tuple
diff --git a/src/pip/_internal/utils/datetime.py b/src/pip/_internal/utils/datetime.py
index 8668b3b0ec1..776e49898f7 100644
--- a/src/pip/_internal/utils/datetime.py
+++ b/src/pip/_internal/utils/datetime.py
@@ -1,5 +1,4 @@
-"""For when pip wants to check the date or time.
-"""
+"""For when pip wants to check the date or time."""
 
 import datetime
 
diff --git a/src/pip/_internal/utils/entrypoints.py b/src/pip/_internal/utils/entrypoints.py
index 15013693854..696148c5097 100644
--- a/src/pip/_internal/utils/entrypoints.py
+++ b/src/pip/_internal/utils/entrypoints.py
@@ -77,7 +77,10 @@ def get_best_invocation_for_this_python() -> str:
 
     # Try to use the basename, if it's the first executable.
     found_executable = shutil.which(exe_name)
-    if found_executable and os.path.samefile(found_executable, exe):
+    # Virtual environments often symlink to their parent Python binaries, but we don't
+    # want to treat the Python binaries as equivalent when the environment's Python is
+    # not on PATH (not activated). Thus, we don't follow symlinks.
+    if found_executable and os.path.samestat(os.lstat(found_executable), os.lstat(exe)):
         return exe_name
 
     # Use the full executable name, because we couldn't find something simpler.
diff --git a/src/pip/_internal/utils/filetypes.py b/src/pip/_internal/utils/filetypes.py
index 5948570178f..5644638222c 100644
--- a/src/pip/_internal/utils/filetypes.py
+++ b/src/pip/_internal/utils/filetypes.py
@@ -1,5 +1,4 @@
-"""Filetype information.
-"""
+"""Filetype information."""
 
 from typing import Tuple
 
diff --git a/src/pip/_internal/utils/unpacking.py b/src/pip/_internal/utils/unpacking.py
index 87a6d19ab5a..9a4ad8a334f 100644
--- a/src/pip/_internal/utils/unpacking.py
+++ b/src/pip/_internal/utils/unpacking.py
@@ -1,5 +1,4 @@
-"""Utilities related archives.
-"""
+"""Utilities related archives."""
 
 import logging
 import os
diff --git a/src/pip/_internal/utils/wheel.py b/src/pip/_internal/utils/wheel.py
index f85aee8a3f9..70e186cdfd1 100644
--- a/src/pip/_internal/utils/wheel.py
+++ b/src/pip/_internal/utils/wheel.py
@@ -1,5 +1,4 @@
-"""Support functions for working with wheel files.
-"""
+"""Support functions for working with wheel files."""
 
 import logging
 from email.message import Message
diff --git a/src/pip/_internal/wheel_builder.py b/src/pip/_internal/wheel_builder.py
index 93f8e1f5b2f..00319cb5673 100644
--- a/src/pip/_internal/wheel_builder.py
+++ b/src/pip/_internal/wheel_builder.py
@@ -1,5 +1,4 @@
-"""Orchestrator for building wheels from InstallRequirements.
-"""
+"""Orchestrator for building wheels from InstallRequirements."""
 
 import logging
 import os.path
diff --git a/tests/functional/test_cli.py b/tests/functional/test_cli.py
index 5be66d88eac..65946a1f46a 100644
--- a/tests/functional/test_cli.py
+++ b/tests/functional/test_cli.py
@@ -1,5 +1,4 @@
-"""Basic CLI functionality checks.
-"""
+"""Basic CLI functionality checks."""
 
 import subprocess
 import sys
diff --git a/tests/functional/test_configuration.py b/tests/functional/test_configuration.py
index 56cac572c4f..f049adf6b21 100644
--- a/tests/functional/test_configuration.py
+++ b/tests/functional/test_configuration.py
@@ -1,5 +1,4 @@
-"""Tests for the config command
-"""
+"""Tests for the config command"""
 
 import re
 import textwrap
diff --git a/tests/lib/configuration_helpers.py b/tests/lib/configuration_helpers.py
index b6e398c5bf1..a802c569878 100644
--- a/tests/lib/configuration_helpers.py
+++ b/tests/lib/configuration_helpers.py
@@ -1,5 +1,4 @@
-"""Helpers for tests that check configuration
-"""
+"""Helpers for tests that check configuration"""
 
 import contextlib
 import functools
diff --git a/tests/lib/filesystem.py b/tests/lib/filesystem.py
index e05e2703e9c..363220e1129 100644
--- a/tests/lib/filesystem.py
+++ b/tests/lib/filesystem.py
@@ -1,5 +1,4 @@
-"""Helpers for filesystem-dependent tests.
-"""
+"""Helpers for filesystem-dependent tests."""
 
 import os
 from contextlib import contextmanager
diff --git a/tests/lib/options_helpers.py b/tests/lib/options_helpers.py
index 4444fa3e97b..92325dddbd1 100644
--- a/tests/lib/options_helpers.py
+++ b/tests/lib/options_helpers.py
@@ -1,5 +1,4 @@
-"""Provides helper classes for testing option handling in pip
-"""
+"""Provides helper classes for testing option handling in pip"""
 
 from optparse import Values
 from typing import List, Tuple
diff --git a/tests/lib/requests_mocks.py b/tests/lib/requests_mocks.py
index a70a9b2b048..971afaed027 100644
--- a/tests/lib/requests_mocks.py
+++ b/tests/lib/requests_mocks.py
@@ -1,5 +1,4 @@
-"""Helper classes as mocks for requests objects.
-"""
+"""Helper classes as mocks for requests objects."""
 
 from io import BytesIO
 from typing import Any, Callable, Dict, Iterator, List, Optional
diff --git a/tests/lib/server.py b/tests/lib/server.py
index 96ac5930dc9..faeaa66eb1d 100644
--- a/tests/lib/server.py
+++ b/tests/lib/server.py
@@ -48,7 +48,7 @@ def make_environ(self) -> Dict[str, Any]:
 
 
 def _mock_wsgi_adapter(
-    mock: Callable[["WSGIEnvironment", "StartResponse"], "WSGIApplication"]
+    mock: Callable[["WSGIEnvironment", "StartResponse"], "WSGIApplication"],
 ) -> "WSGIApplication":
     """Uses a mock to record function arguments and provide
     the actual function that should respond.
diff --git a/tests/lib/test_wheel.py b/tests/lib/test_wheel.py
index abbfaf77ef5..ebf448ff503 100644
--- a/tests/lib/test_wheel.py
+++ b/tests/lib/test_wheel.py
@@ -1,5 +1,4 @@
-"""Tests for wheel helper.
-"""
+"""Tests for wheel helper."""
 
 import csv
 from email import message_from_string
diff --git a/tests/lib/wheel.py b/tests/lib/wheel.py
index e2634e72c86..43b382919f6 100644
--- a/tests/lib/wheel.py
+++ b/tests/lib/wheel.py
@@ -1,5 +1,4 @@
-"""Helper for building wheels as would be in test cases.
-"""
+"""Helper for building wheels as would be in test cases."""
 
 import csv
 import itertools
diff --git a/tests/unit/resolution_resolvelib/test_resolver.py b/tests/unit/resolution_resolvelib/test_resolver.py
index 18238eef134..9a0e4c90825 100644
--- a/tests/unit/resolution_resolvelib/test_resolver.py
+++ b/tests/unit/resolution_resolvelib/test_resolver.py
@@ -35,7 +35,7 @@ def resolver(preparer: RequirementPreparer, finder: PackageFinder) -> Resolver:
 
 
 def _make_graph(
-    edges: List[Tuple[Optional[str], Optional[str]]]
+    edges: List[Tuple[Optional[str], Optional[str]]],
 ) -> "DirectedGraph[Optional[str]]":
     """Build graph from edge declarations."""
 
diff --git a/tests/unit/test_appdirs.py b/tests/unit/test_appdirs.py
index 6e6521dd5c0..51bd6828e2a 100644
--- a/tests/unit/test_appdirs.py
+++ b/tests/unit/test_appdirs.py
@@ -66,7 +66,7 @@ def test_user_cache_dir_unicode(self, monkeypatch: pytest.MonkeyPatch) -> None:
             return
 
         def my_get_win_folder(csidl_name: str) -> str:
-            return "\u00DF\u00E4\u03B1\u20AC"
+            return "\u00df\u00e4\u03b1\u20ac"
 
         monkeypatch.setattr(
             platformdirs.windows,  # type: ignore
diff --git a/tests/unit/test_base_command.py b/tests/unit/test_base_command.py
index f9fae651422..87665fbde43 100644
--- a/tests/unit/test_base_command.py
+++ b/tests/unit/test_base_command.py
@@ -56,8 +56,8 @@ class FakeCommandWithUnicode(FakeCommand):
     _name = "fake_unicode"
 
     def run(self, options: Values, args: List[str]) -> int:
-        logging.getLogger("pip.tests").info(b"bytes here \xE9")
-        logging.getLogger("pip.tests").info(b"unicode here \xC3\xA9".decode("utf-8"))
+        logging.getLogger("pip.tests").info(b"bytes here \xe9")
+        logging.getLogger("pip.tests").info(b"unicode here \xc3\xa9".decode("utf-8"))
         return SUCCESS
 
 
diff --git a/tests/unit/test_configuration.py b/tests/unit/test_configuration.py
index 29a268c7875..73b7d68c399 100644
--- a/tests/unit/test_configuration.py
+++ b/tests/unit/test_configuration.py
@@ -1,5 +1,4 @@
-"""Tests for all things related to the configuration
-"""
+"""Tests for all things related to the configuration"""
 
 import re
 from unittest.mock import MagicMock
diff --git a/tests/unit/test_models.py b/tests/unit/test_models.py
index 2550cae412d..c09314e50cf 100644
--- a/tests/unit/test_models.py
+++ b/tests/unit/test_models.py
@@ -1,5 +1,4 @@
-"""Tests for various classes in pip._internal.models
-"""
+"""Tests for various classes in pip._internal.models"""
 
 from pip._vendor.packaging.version import parse as parse_version
 
diff --git a/tools/release/check_version.py b/tools/release/check_version.py
index de3658faacd..f5c880533e7 100644
--- a/tools/release/check_version.py
+++ b/tools/release/check_version.py
@@ -1,5 +1,4 @@
-"""Checks if the version is acceptable, as per this project's release process.
-"""
+"""Checks if the version is acceptable, as per this project's release process."""
 
 import sys
 from datetime import datetime