diff --git a/cibuildwheel/architecture.py b/cibuildwheel/architecture.py
index bf0af268..ad611594 100644
--- a/cibuildwheel/architecture.py
+++ b/cibuildwheel/architecture.py
@@ -9,8 +9,7 @@ from enum import StrEnum, auto
 from typing import Final, Literal
 
 from cibuildwheel import errors
-
-from .typing import PlatformName
+from cibuildwheel.typing import PlatformName
 
 PRETTY_NAMES: Final[dict[PlatformName, str]] = {
     "linux": "Linux",
diff --git a/cibuildwheel/ci.py b/cibuildwheel/ci.py
index 500d435e..ae111de3 100644
--- a/cibuildwheel/ci.py
+++ b/cibuildwheel/ci.py
@@ -2,7 +2,7 @@ import os
 import re
 from enum import Enum
 
-from .util.helpers import strtobool
+from cibuildwheel.util.helpers import strtobool
 
 ANSI_CODE_REGEX = re.compile(r"(\033\[[0-9;]*m)")
 
diff --git a/cibuildwheel/environment.py b/cibuildwheel/environment.py
index 4e603f99..7e371b28 100644
--- a/cibuildwheel/environment.py
+++ b/cibuildwheel/environment.py
@@ -5,7 +5,7 @@ from typing import Any, Protocol
 import bashlex
 import bashlex.errors
 
-from . import bashlex_eval
+from cibuildwheel import bashlex_eval
 
 
 class EnvironmentParseError(Exception):
diff --git a/cibuildwheel/frontend.py b/cibuildwheel/frontend.py
index 6f54de55..eb55f4f6 100644
--- a/cibuildwheel/frontend.py
+++ b/cibuildwheel/frontend.py
@@ -4,8 +4,8 @@ import typing
 from collections.abc import Sequence
 from typing import Literal, Self, get_args
 
-from .logger import log
-from .util.helpers import parse_key_value_string
+from cibuildwheel.logger import log
+from cibuildwheel.util.helpers import parse_key_value_string
 
 BuildFrontendName = Literal["pip", "build", "build[uv]", "uv"]
 
diff --git a/cibuildwheel/logger.py b/cibuildwheel/logger.py
index dad70309..e2b5776c 100644
--- a/cibuildwheel/logger.py
+++ b/cibuildwheel/logger.py
@@ -15,10 +15,10 @@ from typing import IO, TYPE_CHECKING, AnyStr, Final, Literal
 
 import humanize
 
-from .ci import CIProvider, detect_ci_provider, filter_ansi_codes
+from cibuildwheel.ci import CIProvider, detect_ci_provider, filter_ansi_codes
 
 if TYPE_CHECKING:
-    from .options import Options
+    from cibuildwheel.options import Options
 
 FoldPattern = tuple[str, str]
 DEFAULT_FOLD_PATTERN: Final[FoldPattern] = ("{name}", "")
diff --git a/cibuildwheel/oci_container.py b/cibuildwheel/oci_container.py
index 99351461..55ab99e6 100644
--- a/cibuildwheel/oci_container.py
+++ b/cibuildwheel/oci_container.py
@@ -16,12 +16,12 @@ from pathlib import Path, PurePath, PurePosixPath
 from types import TracebackType
 from typing import IO, Literal, Self, assert_never
 
-from .ci import CIProvider, detect_ci_provider
-from .errors import OCIEngineTooOldError
-from .logger import log
-from .typing import PathOrStr
-from .util.cmd import call
-from .util.helpers import FlexibleVersion, parse_key_value_string, strtobool
+from cibuildwheel.ci import CIProvider, detect_ci_provider
+from cibuildwheel.errors import OCIEngineTooOldError
+from cibuildwheel.logger import log
+from cibuildwheel.typing import PathOrStr
+from cibuildwheel.util.cmd import call
+from cibuildwheel.util.helpers import FlexibleVersion, parse_key_value_string, strtobool
 
 ContainerEngineName = Literal["docker", "podman"]
 
diff --git a/cibuildwheel/options.py b/cibuildwheel/options.py
index af946a88..d1efbbdc 100644
--- a/cibuildwheel/options.py
+++ b/cibuildwheel/options.py
@@ -14,18 +14,18 @@ from typing import Any, Final, Literal, Self, assert_never
 
 from packaging.specifiers import SpecifierSet
 
-from . import errors
-from .architecture import Architecture
-from .environment import EnvironmentParseError, ParsedEnvironment, parse_environment
-from .frontend import BuildFrontendConfig
-from .logger import log
-from .oci_container import OCIContainerEngineConfig
-from .projectfiles import get_requires_python_str, resolve_dependency_groups
-from .selector import BuildSelector, EnableGroup, TestSelector, selector_matches
-from .typing import PLATFORMS, PlatformName
-from .util import resources
-from .util.helpers import format_safe, parse_key_value_string, strtobool, unwrap
-from .util.packaging import DependencyConstraints
+from cibuildwheel import errors
+from cibuildwheel.architecture import Architecture
+from cibuildwheel.environment import EnvironmentParseError, ParsedEnvironment, parse_environment
+from cibuildwheel.frontend import BuildFrontendConfig
+from cibuildwheel.logger import log
+from cibuildwheel.oci_container import OCIContainerEngineConfig
+from cibuildwheel.projectfiles import get_requires_python_str, resolve_dependency_groups
+from cibuildwheel.selector import BuildSelector, EnableGroup, TestSelector, selector_matches
+from cibuildwheel.typing import PLATFORMS, PlatformName
+from cibuildwheel.util import resources
+from cibuildwheel.util.helpers import format_safe, parse_key_value_string, strtobool, unwrap
+from cibuildwheel.util.packaging import DependencyConstraints
 
 MANYLINUX_ARCHS: Final[tuple[str, ...]] = (
     "x86_64",
diff --git a/cibuildwheel/platforms/android.py b/cibuildwheel/platforms/android.py
index 5f4839e5..b4c237ca 100644
--- a/cibuildwheel/platforms/android.py
+++ b/cibuildwheel/platforms/android.py
@@ -22,19 +22,19 @@ from elftools.common.exceptions import ELFError
 from elftools.elf.elffile import ELFFile
 from filelock import FileLock
 
-from .. import errors, platforms  # pylint: disable=cyclic-import
-from ..architecture import Architecture, arch_synonym
-from ..frontend import get_build_frontend_extra_flags, parse_config_settings
-from ..logger import log
-from ..options import BuildOptions, Options
-from ..selector import BuildSelector
-from ..util import resources
-from ..util.cmd import call, shell
-from ..util.file import CIBW_CACHE_PATH, copy_test_sources, download, move_file
-from ..util.helpers import prepare_command
-from ..util.packaging import find_compatible_wheel
-from ..util.python_build_standalone import create_python_build_standalone_environment
-from ..venv import constraint_flags, find_uv, virtualenv
+from cibuildwheel import errors, platforms  # pylint: disable=cyclic-import
+from cibuildwheel.architecture import Architecture, arch_synonym
+from cibuildwheel.frontend import get_build_frontend_extra_flags, parse_config_settings
+from cibuildwheel.logger import log
+from cibuildwheel.options import BuildOptions, Options
+from cibuildwheel.selector import BuildSelector
+from cibuildwheel.util import resources
+from cibuildwheel.util.cmd import call, shell
+from cibuildwheel.util.file import CIBW_CACHE_PATH, copy_test_sources, download, move_file
+from cibuildwheel.util.helpers import prepare_command
+from cibuildwheel.util.packaging import find_compatible_wheel
+from cibuildwheel.util.python_build_standalone import create_python_build_standalone_environment
+from cibuildwheel.venv import constraint_flags, find_uv, virtualenv
 
 ANDROID_TRIPLET = {
     "arm64_v8a": "aarch64-linux-android",
diff --git a/cibuildwheel/platforms/ios.py b/cibuildwheel/platforms/ios.py
index bdb2ad8b..33e6899c 100644
--- a/cibuildwheel/platforms/ios.py
+++ b/cibuildwheel/platforms/ios.py
@@ -13,34 +13,24 @@ from typing import TYPE_CHECKING, assert_never
 
 from filelock import FileLock
 
-from .. import errors
-from ..frontend import (
-    BuildFrontendName,
-    get_build_frontend_extra_flags,
-)
-from ..logger import log
-from ..util import resources
-from ..util.cmd import call, shell, split_command
-from ..util.file import (
-    CIBW_CACHE_PATH,
-    copy_test_sources,
-    download,
-    move_file,
-)
-from ..util.helpers import prepare_command, unwrap_preserving_paragraphs
-from ..util.packaging import (
-    find_compatible_wheel,
-)
-from ..venv import constraint_flags, virtualenv
-from .macos import install_cpython as install_build_cpython
+from cibuildwheel import errors
+from cibuildwheel.frontend import BuildFrontendName, get_build_frontend_extra_flags
+from cibuildwheel.logger import log
+from cibuildwheel.platforms.macos import install_cpython as install_build_cpython
+from cibuildwheel.util import resources
+from cibuildwheel.util.cmd import call, shell, split_command
+from cibuildwheel.util.file import CIBW_CACHE_PATH, copy_test_sources, download, move_file
+from cibuildwheel.util.helpers import prepare_command, unwrap_preserving_paragraphs
+from cibuildwheel.util.packaging import find_compatible_wheel
+from cibuildwheel.venv import constraint_flags, virtualenv
 
 if TYPE_CHECKING:
     from collections.abc import Sequence, Set
 
-    from ..architecture import Architecture
-    from ..environment import ParsedEnvironment
-    from ..options import Options
-    from ..selector import BuildSelector
+    from cibuildwheel.architecture import Architecture
+    from cibuildwheel.environment import ParsedEnvironment
+    from cibuildwheel.options import Options
+    from cibuildwheel.selector import BuildSelector
 
 
 @dataclasses.dataclass(frozen=True, kw_only=True)
diff --git a/cibuildwheel/platforms/linux.py b/cibuildwheel/platforms/linux.py
index 7b9b0c37..595835f4 100644
--- a/cibuildwheel/platforms/linux.py
+++ b/cibuildwheel/platforms/linux.py
@@ -8,20 +8,20 @@ from collections.abc import Iterable, Iterator, Sequence, Set
 from pathlib import Path, PurePath, PurePosixPath
 from typing import TYPE_CHECKING, assert_never
 
-from .. import errors
-from ..architecture import Architecture
-from ..frontend import get_build_frontend_extra_flags
-from ..logger import log
-from ..oci_container import OCIContainer, OCIContainerEngineConfig, OCIPlatform
-from ..options import BuildOptions, Options
-from ..selector import BuildSelector
-from ..util import resources
-from ..util.file import copy_test_sources
-from ..util.helpers import prepare_command, unwrap
-from ..util.packaging import find_compatible_wheel
+from cibuildwheel import errors
+from cibuildwheel.architecture import Architecture
+from cibuildwheel.frontend import get_build_frontend_extra_flags
+from cibuildwheel.logger import log
+from cibuildwheel.oci_container import OCIContainer, OCIContainerEngineConfig, OCIPlatform
+from cibuildwheel.options import BuildOptions, Options
+from cibuildwheel.selector import BuildSelector
+from cibuildwheel.util import resources
+from cibuildwheel.util.file import copy_test_sources
+from cibuildwheel.util.helpers import prepare_command, unwrap
+from cibuildwheel.util.packaging import find_compatible_wheel
 
 if TYPE_CHECKING:
-    from ..typing import PathOrStr
+    from cibuildwheel.typing import PathOrStr
 
 ARCHITECTURE_OCI_PLATFORM_MAP = {
     Architecture.x86_64: OCIPlatform.AMD64,
diff --git a/cibuildwheel/platforms/macos.py b/cibuildwheel/platforms/macos.py
index e5b4d9e3..ad084fd6 100644
--- a/cibuildwheel/platforms/macos.py
+++ b/cibuildwheel/platforms/macos.py
@@ -15,25 +15,20 @@ from typing import Literal, assert_never
 from filelock import FileLock
 from packaging.version import Version
 
-from .. import errors
-from ..architecture import Architecture
-from ..ci import detect_ci_provider
-from ..environment import ParsedEnvironment
-from ..frontend import BuildFrontendName, get_build_frontend_extra_flags
-from ..logger import log
-from ..options import Options
-from ..selector import BuildSelector
-from ..util import resources
-from ..util.cmd import call, shell
-from ..util.file import (
-    CIBW_CACHE_PATH,
-    copy_test_sources,
-    download,
-    move_file,
-)
-from ..util.helpers import prepare_command, unwrap
-from ..util.packaging import find_compatible_wheel, get_pip_version
-from ..venv import constraint_flags, find_uv, virtualenv
+from cibuildwheel import errors
+from cibuildwheel.architecture import Architecture
+from cibuildwheel.ci import detect_ci_provider
+from cibuildwheel.environment import ParsedEnvironment
+from cibuildwheel.frontend import BuildFrontendName, get_build_frontend_extra_flags
+from cibuildwheel.logger import log
+from cibuildwheel.options import Options
+from cibuildwheel.selector import BuildSelector
+from cibuildwheel.util import resources
+from cibuildwheel.util.cmd import call, shell
+from cibuildwheel.util.file import CIBW_CACHE_PATH, copy_test_sources, download, move_file
+from cibuildwheel.util.helpers import prepare_command, unwrap
+from cibuildwheel.util.packaging import find_compatible_wheel, get_pip_version
+from cibuildwheel.venv import constraint_flags, find_uv, virtualenv
 
 
 @functools.cache
diff --git a/cibuildwheel/platforms/pyodide.py b/cibuildwheel/platforms/pyodide.py
index 30d5f25d..15612a85 100644
--- a/cibuildwheel/platforms/pyodide.py
+++ b/cibuildwheel/platforms/pyodide.py
@@ -14,16 +14,16 @@ from typing import Final, TypedDict
 
 from filelock import FileLock
 
-from .. import errors
-from ..architecture import Architecture
-from ..environment import ParsedEnvironment
-from ..frontend import get_build_frontend_extra_flags
-from ..logger import log
-from ..options import Options
-from ..selector import BuildSelector
-from ..util import resources
-from ..util.cmd import call, shell
-from ..util.file import (
+from cibuildwheel import errors
+from cibuildwheel.architecture import Architecture
+from cibuildwheel.environment import ParsedEnvironment
+from cibuildwheel.frontend import get_build_frontend_extra_flags
+from cibuildwheel.logger import log
+from cibuildwheel.options import Options
+from cibuildwheel.selector import BuildSelector
+from cibuildwheel.util import resources
+from cibuildwheel.util.cmd import call, shell
+from cibuildwheel.util.file import (
     CIBW_CACHE_PATH,
     copy_test_sources,
     download,
@@ -31,13 +31,13 @@ from ..util.file import (
     extract_zip,
     move_file,
 )
-from ..util.helpers import prepare_command, unwrap, unwrap_preserving_paragraphs
-from ..util.packaging import find_compatible_wheel, get_pip_version
-from ..util.python_build_standalone import (
+from cibuildwheel.util.helpers import prepare_command, unwrap, unwrap_preserving_paragraphs
+from cibuildwheel.util.packaging import find_compatible_wheel, get_pip_version
+from cibuildwheel.util.python_build_standalone import (
     PythonBuildStandaloneError,
     create_python_build_standalone_environment,
 )
-from ..venv import constraint_flags, virtualenv
+from cibuildwheel.venv import constraint_flags, virtualenv
 
 IS_WIN: Final[bool] = sys.platform.startswith("win")
 
diff --git a/cibuildwheel/platforms/windows.py b/cibuildwheel/platforms/windows.py
index d28643b4..18d400a9 100644
--- a/cibuildwheel/platforms/windows.py
+++ b/cibuildwheel/platforms/windows.py
@@ -12,19 +12,25 @@ from typing import assert_never
 
 from filelock import FileLock
 
-from .. import errors
-from ..architecture import Architecture
-from ..environment import ParsedEnvironment
-from ..frontend import BuildFrontendName, get_build_frontend_extra_flags
-from ..logger import log
-from ..options import Options
-from ..selector import BuildSelector
-from ..util import resources
-from ..util.cmd import call, shell
-from ..util.file import CIBW_CACHE_PATH, copy_test_sources, download, extract_zip, move_file
-from ..util.helpers import prepare_command, unwrap
-from ..util.packaging import find_compatible_wheel, get_pip_version
-from ..venv import constraint_flags, find_uv, virtualenv
+from cibuildwheel import errors
+from cibuildwheel.architecture import Architecture
+from cibuildwheel.environment import ParsedEnvironment
+from cibuildwheel.frontend import BuildFrontendName, get_build_frontend_extra_flags
+from cibuildwheel.logger import log
+from cibuildwheel.options import Options
+from cibuildwheel.selector import BuildSelector
+from cibuildwheel.util import resources
+from cibuildwheel.util.cmd import call, shell
+from cibuildwheel.util.file import (
+    CIBW_CACHE_PATH,
+    copy_test_sources,
+    download,
+    extract_zip,
+    move_file,
+)
+from cibuildwheel.util.helpers import prepare_command, unwrap
+from cibuildwheel.util.packaging import find_compatible_wheel, get_pip_version
+from cibuildwheel.venv import constraint_flags, find_uv, virtualenv
 
 
 def get_nuget_args(
diff --git a/cibuildwheel/schema.py b/cibuildwheel/schema.py
index ef8f603b..ec070278 100644
--- a/cibuildwheel/schema.py
+++ b/cibuildwheel/schema.py
@@ -1,7 +1,7 @@
 import json
 from typing import Any
 
-from .util import resources
+from cibuildwheel.util import resources
 
 
 def get_schema(tool_name: str = "cibuildwheel") -> dict[str, Any]:
diff --git a/cibuildwheel/util/cmd.py b/cibuildwheel/util/cmd.py
index 413d6f80..aba6cf17 100644
--- a/cibuildwheel/util/cmd.py
+++ b/cibuildwheel/util/cmd.py
@@ -7,8 +7,8 @@ import typing
 from collections.abc import Iterator, Mapping
 from typing import Final, Literal
 
-from ..errors import FatalError
-from ..typing import PathOrStr
+from cibuildwheel.errors import FatalError
+from cibuildwheel.typing import PathOrStr
 
 _IS_WIN: Final[bool] = sys.platform.startswith("win")
 
diff --git a/cibuildwheel/util/file.py b/cibuildwheel/util/file.py
index b93a5e50..04e40f3d 100644
--- a/cibuildwheel/util/file.py
+++ b/cibuildwheel/util/file.py
@@ -12,7 +12,7 @@ from zipfile import ZipFile
 import certifi
 from platformdirs import user_cache_path
 
-from ..errors import FatalError
+from cibuildwheel.errors import FatalError
 
 DEFAULT_CIBW_CACHE_PATH: Final[Path] = user_cache_path(appname="cibuildwheel", appauthor="pypa")
 CIBW_CACHE_PATH: Final[Path] = Path(
diff --git a/cibuildwheel/util/helpers.py b/cibuildwheel/util/helpers.py
index adefb495..6e17cb2e 100644
--- a/cibuildwheel/util/helpers.py
+++ b/cibuildwheel/util/helpers.py
@@ -7,7 +7,7 @@ import textwrap
 from collections import defaultdict
 from collections.abc import Sequence
 
-from ..typing import PathOrStr
+from cibuildwheel.typing import PathOrStr
 
 
 def format_safe(template: str, **kwargs: str | os.PathLike[str]) -> str:
diff --git a/cibuildwheel/util/packaging.py b/cibuildwheel/util/packaging.py
index c3d8c21d..abb8badd 100644
--- a/cibuildwheel/util/packaging.py
+++ b/cibuildwheel/util/packaging.py
@@ -6,9 +6,9 @@ from typing import Any, Literal, Self, TypeVar
 
 from packaging.utils import parse_wheel_filename
 
-from . import resources
-from .cmd import call
-from .helpers import parse_key_value_string, unwrap
+from cibuildwheel.util import resources
+from cibuildwheel.util.cmd import call
+from cibuildwheel.util.helpers import parse_key_value_string, unwrap
 
 
 @dataclass(kw_only=True)
diff --git a/cibuildwheel/util/resources.py b/cibuildwheel/util/resources.py
index 4be747a9..c69fd949 100644
--- a/cibuildwheel/util/resources.py
+++ b/cibuildwheel/util/resources.py
@@ -3,7 +3,7 @@ import tomllib
 from pathlib import Path
 from typing import Final
 
-from ..typing import PlatformName
+from cibuildwheel.typing import PlatformName
 
 PATH: Final[Path] = Path(__file__).parent.parent / "resources"
 INSTALL_CERTIFI_SCRIPT: Final[Path] = PATH / "install_certifi.py"
diff --git a/cibuildwheel/venv.py b/cibuildwheel/venv.py
index 49f4dea7..dd4fe90a 100644
--- a/cibuildwheel/venv.py
+++ b/cibuildwheel/venv.py
@@ -12,9 +12,9 @@ from filelock import FileLock
 from packaging.requirements import InvalidRequirement, Requirement
 from packaging.version import Version
 
-from .util import resources
-from .util.cmd import call
-from .util.file import CIBW_CACHE_PATH, download
+from cibuildwheel.util import resources
+from cibuildwheel.util.cmd import call
+from cibuildwheel.util.file import CIBW_CACHE_PATH, download
 
 _IS_WIN: Final[bool] = sys.platform.startswith("win")
 
diff --git a/pyproject.toml b/pyproject.toml
index f2b5169f..24323b03 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -211,6 +211,7 @@ extend-select = [
   "RUF",         # Ruff-specific
   "SIM",         # flake8-simplify
   "TID251",      # flake8-tidy-imports.banned-api
+  "TID252",      # flake8-tidy-imports.relative-imports
   "UP",          # pyupgrade
   "YTT",         # flake8-2020
   "EXE",         # flake8-executable
@@ -236,6 +237,7 @@ ignore = [
   "PTH123",  # open -> Path.open
 ]
 flake8-unused-arguments.ignore-variadic-names = true
+flake8-tidy-imports.ban-relative-imports = "all"
 
 [tool.ruff.lint.flake8-tidy-imports.banned-api]
 "typing.Mapping".msg = "Use collections.abc.Mapping instead."
@@ -245,7 +247,8 @@ flake8-unused-arguments.ignore-variadic-names = true
 "typing.Set".msg = "Use collections.abc.Set instead."
 
 [tool.ruff.lint.per-file-ignores]
-"unit_test/*" = ["PLC1901"]
+"unit_test/*" = ["PLC1901", "TID252"]
+"test/*" = ["TID252"]
 "bin/*" = ["TID251"]
 "cibuildwheel/resources/install_certifi.py" = ["PTH"]