diff --git a/stdlib/@tests/stubtest_allowlists/py315.txt b/stdlib/@tests/stubtest_allowlists/py315.txt
index 7354dac4dc90..e99551a48ae0 100644
--- a/stdlib/@tests/stubtest_allowlists/py315.txt
+++ b/stdlib/@tests/stubtest_allowlists/py315.txt
@@ -17,7 +17,6 @@ _struct.pack
 _struct.pack_into
 _thread.RLock.__exit__
 _thread.lock.__exit__
-copy.deepcopy
 dataclasses.MISSING
 dataclasses._MISSING_TYPE
 dataclasses.field
diff --git a/stdlib/copy.pyi b/stdlib/copy.pyi
index 373899ea2635..925bed1aada2 100644
--- a/stdlib/copy.pyi
+++ b/stdlib/copy.pyi
@@ -14,10 +14,15 @@ class _SupportsReplace(Protocol[_RT_co]):
 # None in CPython but non-None in Jython
 PyStringMap: Any
 
-# Note: memo and _nil are internal kwargs.
-def deepcopy(x: _T, memo: dict[int, Any] | None = None, _nil: Any = []) -> _T: ...
 def copy(x: _T) -> _T: ...
 
+if sys.version_info >= (3, 15):
+    def deepcopy(x: _T, memo: dict[int, Any] | None = None) -> _T: ...
+
+else:
+    # Note: memo and _nil are internal kwargs.
+    def deepcopy(x: _T, memo: dict[int, Any] | None = None, _nil: Any = []) -> _T: ...
+
 if sys.version_info >= (3, 13):
     __all__ += ["replace"]
     # The types accepted by `**changes` match those of `obj.__replace__`.