diff --git a/cibuildwheel/architecture.py b/cibuildwheel/architecture.py
index 9d39d553..c6df9e36 100644
--- a/cibuildwheel/architecture.py
+++ b/cibuildwheel/architecture.py
@@ -4,9 +4,9 @@ import re
 from enum import Enum
 from typing import Set
 
-from .typing import Literal, PlatformName, assert_never
+from .typing import Final, Literal, PlatformName, assert_never
 
-PRETTY_NAMES = {"linux": "Linux", "macos": "macOS", "windows": "Windows"}
+PRETTY_NAMES: Final = {"linux": "Linux", "macos": "macOS", "windows": "Windows"}
 
 
 @functools.total_ordering
diff --git a/cibuildwheel/logger.py b/cibuildwheel/logger.py
index f79c51ad..6a12d782 100644
--- a/cibuildwheel/logger.py
+++ b/cibuildwheel/logger.py
@@ -5,16 +5,17 @@ import sys
 import time
 from typing import IO, AnyStr, Optional, Union
 
+from cibuildwheel.typing import Final
 from cibuildwheel.util import CIProvider, detect_ci_provider
 
-DEFAULT_FOLD_PATTERN = ("{name}", "")
-FOLD_PATTERNS = {
+DEFAULT_FOLD_PATTERN: Final = ("{name}", "")
+FOLD_PATTERNS: Final = {
     "azure": ("##[group]{name}", "##[endgroup]"),
     "travis": ("travis_fold:start:{identifier}\n{name}", "travis_fold:end:{identifier}"),
     "github": ("::group::{name}", "::endgroup::{name}"),
 }
 
-PLATFORM_IDENTIFIER_DESCRIPTIONS = {
+PLATFORM_IDENTIFIER_DESCRIPTIONS: Final = {
     "manylinux_x86_64": "manylinux x86_64",
     "manylinux_i686": "manylinux i686",
     "manylinux_aarch64": "manylinux aarch64",
diff --git a/cibuildwheel/util.py b/cibuildwheel/util.py
index c116dc13..d0602fda 100644
--- a/cibuildwheel/util.py
+++ b/cibuildwheel/util.py
@@ -39,15 +39,15 @@ from packaging.specifiers import SpecifierSet
 from packaging.version import Version
 from platformdirs import user_cache_path
 
-from cibuildwheel.typing import Literal, PathOrStr, PlatformName
+from cibuildwheel.typing import Final, Literal, PathOrStr, PlatformName
 
-resources_dir = Path(__file__).parent / "resources"
+resources_dir: Final = Path(__file__).parent / "resources"
 
-install_certifi_script = resources_dir / "install_certifi.py"
+install_certifi_script: Final = resources_dir / "install_certifi.py"
 
-BuildFrontend = Literal["pip", "build"]
+BuildFrontend: Final = Literal["pip", "build"]
 
-MANYLINUX_ARCHS = (
+MANYLINUX_ARCHS: Final = (
     "x86_64",
     "i686",
     "pypy_x86_64",
@@ -58,7 +58,7 @@ MANYLINUX_ARCHS = (
     "pypy_i686",
 )
 
-MUSLLINUX_ARCHS = (
+MUSLLINUX_ARCHS: Final = (
     "x86_64",
     "i686",
     "aarch64",
@@ -66,10 +66,10 @@ MUSLLINUX_ARCHS = (
     "s390x",
 )
 
-DEFAULT_CIBW_CACHE_PATH = user_cache_path(appname="cibuildwheel", appauthor="pypa")
-CIBW_CACHE_PATH = Path(os.environ.get("CIBW_CACHE_PATH", DEFAULT_CIBW_CACHE_PATH)).resolve()
+DEFAULT_CIBW_CACHE_PATH: Final = user_cache_path(appname="cibuildwheel", appauthor="pypa")
+CIBW_CACHE_PATH: Final = Path(os.environ.get("CIBW_CACHE_PATH", DEFAULT_CIBW_CACHE_PATH)).resolve()
 
-IS_WIN = sys.platform.startswith("win")
+IS_WIN: Final = sys.platform.startswith("win")
 
 
 @overload