diff --git a/requirements-tests.txt b/requirements-tests.txt
index 77622c1fd88c..fbd6133d0781 100644
--- a/requirements-tests.txt
+++ b/requirements-tests.txt
@@ -23,3 +23,6 @@ uv==0.4.26
 
 # Utilities for typeshed infrastructure scripts.
 ts_utils @ file:lib
+
+# Libraries required by third-party stubs
+tomli; python_version < "3.11"  # setuptools.compat.py310
diff --git a/stubs/setuptools/setuptools/compat/py310.pyi b/stubs/setuptools/setuptools/compat/py310.pyi
index 9e27329c7d96..0498105394f2 100644
--- a/stubs/setuptools/setuptools/compat/py310.pyi
+++ b/stubs/setuptools/setuptools/compat/py310.pyi
@@ -6,4 +6,4 @@ if sys.version_info >= (3, 11):
     import tomllib
 else:
     # This is actually vendored
-    import tomli as tomllib  # type: ignore[import-not-found] # pyright: ignore[reportMissingImports]
+    import tomli as tomllib