diff --git a/pyproject.toml b/pyproject.toml
index 1acc97220..c8328653b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -197,7 +197,6 @@ module = [
     "sphinx.ext.*",
     "sphinx.highlighting",
     "sphinx.jinja2glue",
-    "sphinx.locale",
     "sphinx.registry",
     "sphinx.roles",
     "sphinx.search.*",
diff --git a/sphinx/locale/__init__.py b/sphinx/locale/__init__.py
index 82330fac6..8e35be60e 100644
--- a/sphinx/locale/__init__.py
+++ b/sphinx/locale/__init__.py
@@ -16,7 +16,7 @@ class _TranslationProxy:
     """
     __slots__ = ('_func', '_args')
 
-    def __new__(cls, func: Callable, *args: str) -> '_TranslationProxy':
+    def __new__(cls, func: Callable[..., str], *args: str) -> '_TranslationProxy':
         if not args:
             # not called with "function" and "arguments", but a plain string
             return str(func)  # type: ignore[return-value]
@@ -25,7 +25,7 @@ class _TranslationProxy:
     def __getnewargs__(self) -> Tuple[str]:
         return (self._func,) + self._args  # type: ignore
 
-    def __init__(self, func: Callable, *args: str) -> None:
+    def __init__(self, func: Callable[..., str], *args: str) -> None:
         self._func = func
         self._args = args
 
@@ -38,10 +38,10 @@ class _TranslationProxy:
     def __getattr__(self, name: str) -> Any:
         return getattr(self.__str__(), name)
 
-    def __getstate__(self) -> Tuple[Callable, Tuple[str, ...]]:
+    def __getstate__(self) -> Tuple[Callable[..., str], Tuple[str, ...]]:
         return self._func, self._args
 
-    def __setstate__(self, tup: Tuple[Callable, Tuple[str]]) -> None:
+    def __setstate__(self, tup: Tuple[Callable[..., str], Tuple[str]]) -> None:
         self._func, self._args = tup
 
     def __copy__(self) -> '_TranslationProxy':