diff --git a/.ci/requirements-mypy.txt b/.ci/requirements-mypy.txt
index 99eac6027..3519707f1 100644
--- a/.ci/requirements-mypy.txt
+++ b/.ci/requirements-mypy.txt
@@ -11,4 +11,4 @@ sphinx
 types-atheris
 types-defusedxml
 types-olefile
-types-setuptools
+types-setuptools>=75.2.0
diff --git a/setup.py b/setup.py
index 82986f140..dcc07eaf6 100644
--- a/setup.py
+++ b/setup.py
@@ -16,11 +16,15 @@ import subprocess
 import sys
 import warnings
 from collections.abc import Iterator
+from typing import TYPE_CHECKING, Any
 
 from pybind11.setup_helpers import ParallelCompile
 from setuptools import Extension, setup
 from setuptools.command.build_ext import build_ext
 
+if TYPE_CHECKING:
+    from setuptools import _BuildInfo
+
 configuration: dict[str, list[str]] = {}
 
 # parse configuration from _custom_build/backend.py
@@ -1072,7 +1076,7 @@ def debug_build() -> bool:
     return hasattr(sys, "gettotalrefcount") or FUZZING_BUILD
 
 
-libraries = [
+libraries: list[tuple[str, _BuildInfo]] = [
     ("pil_imaging_mode", {"sources": ["src/libImaging/Mode.c"]}),
 ]