diff --git a/stdlib/@tests/stubtest_allowlists/py313.txt b/stdlib/@tests/stubtest_allowlists/py313.txt
index 3b02a73ab..e153e52f5 100644
--- a/stdlib/@tests/stubtest_allowlists/py313.txt
+++ b/stdlib/@tests/stubtest_allowlists/py313.txt
@@ -12,9 +12,7 @@ _ctypes.pointer
 _ctypes.sizeof
 _thread.interrupt_main
 _thread.lock
-_thread.stack_size
 _thread.start_joinable_thread
-_thread.start_new_thread
 _tkinter.create
 asyncio.AbstractEventLoop.create_server
 asyncio.AbstractServer.abort_clients
@@ -111,7 +109,6 @@ site.register_readline
 sre_compile.SRE_FLAG_TEMPLATE
 sre_constants.SRE_FLAG_TEMPLATE
 sre_parse.SRE_FLAG_TEMPLATE
-threading.stack_size
 tkinter.Misc.after_info
 tkinter.Misc.busy
 tkinter.Misc.busy_cget
diff --git a/stdlib/_thread.pyi b/stdlib/_thread.pyi
index 4ea9aa060..304cb79ec 100644
--- a/stdlib/_thread.pyi
+++ b/stdlib/_thread.pyi
@@ -13,7 +13,7 @@ error = RuntimeError
 def _count() -> int: ...
 @final
 class LockType:
-    def acquire(self, blocking: bool = ..., timeout: float = ...) -> bool: ...
+    def acquire(self, blocking: bool = True, timeout: float = -1) -> bool: ...
     def release(self) -> None: ...
     def locked(self) -> bool: ...
     def __enter__(self) -> bool: ...
@@ -22,14 +22,14 @@ class LockType:
     ) -> None: ...
 
 @overload
-def start_new_thread(function: Callable[[Unpack[_Ts]], object], args: tuple[Unpack[_Ts]]) -> int: ...
+def start_new_thread(function: Callable[[Unpack[_Ts]], object], args: tuple[Unpack[_Ts]], /) -> int: ...
 @overload
-def start_new_thread(function: Callable[..., object], args: tuple[Any, ...], kwargs: dict[str, Any]) -> int: ...
+def start_new_thread(function: Callable[..., object], args: tuple[Any, ...], kwargs: dict[str, Any], /) -> int: ...
 def interrupt_main() -> None: ...
 def exit() -> NoReturn: ...
 def allocate_lock() -> LockType: ...
 def get_ident() -> int: ...
-def stack_size(size: int = ...) -> int: ...
+def stack_size(size: int = 0, /) -> int: ...
 
 TIMEOUT_MAX: float
 
diff --git a/stdlib/threading.pyi b/stdlib/threading.pyi
index 1ecadef50..c441a0468 100644
--- a/stdlib/threading.pyi
+++ b/stdlib/threading.pyi
@@ -61,7 +61,7 @@ if sys.version_info >= (3, 10):
     def gettrace() -> TraceFunction | None: ...
     def getprofile() -> ProfileFunction | None: ...
 
-def stack_size(size: int = ...) -> int: ...
+def stack_size(size: int = 0, /) -> int: ...
 
 TIMEOUT_MAX: float