diff --git a/stdlib/ipaddress.pyi b/stdlib/ipaddress.pyi
index c514abfa569f..c492a472da41 100644
--- a/stdlib/ipaddress.pyi
+++ b/stdlib/ipaddress.pyi
@@ -109,8 +109,10 @@ class _BaseNetwork(_IPAddressBase, Generic[_A]):
 class _BaseV4:
     __slots__ = ()
     if sys.version_info >= (3, 14):
-        version: Final = 4
-        max_prefixlen: Final = 32
+        # a bare `Final` infers as `int`, which cannot narrow an
+        # `IPv4Network | IPv6Network` union (PYI064 does not account for that)
+        version: Final[Literal[4]] = 4  # noqa: PYI064
+        max_prefixlen: Final[Literal[32]] = 32  # noqa: PYI064
     else:
         @property
         def version(self) -> Literal[4]: ...
@@ -162,8 +164,10 @@ class IPv4Interface(IPv4Address):
 class _BaseV6:
     __slots__ = ()
     if sys.version_info >= (3, 14):
-        version: Final = 6
-        max_prefixlen: Final = 128
+        # a bare `Final` infers as `int`, which cannot narrow an
+        # `IPv4Network | IPv6Network` union (PYI064 does not account for that)
+        version: Final[Literal[6]] = 6  # noqa: PYI064
+        max_prefixlen: Final[Literal[128]] = 128  # noqa: PYI064
     else:
         @property
         def version(self) -> Literal[6]: ...