diff --git a/mypy/typeshed/stdlib/csv.pyi b/mypy/typeshed/stdlib/csv.pyi
index f3b4286a6b49..18b36b20160f 100644
--- a/mypy/typeshed/stdlib/csv.pyi
+++ b/mypy/typeshed/stdlib/csv.pyi
@@ -54,6 +54,10 @@ if sys.version_info < (3, 13):
 
 _T = TypeVar("_T")
 
+# Note that this is often the wrong class: it is only useful for sub-classing
+# (e.g. csv.excel). Dialect objects returned at runtime, such as the return
+# value of get_dialect(), are usually _csv.Dialect, which is not a subclass
+# of csv.Dialect.
 class Dialect:
     delimiter: str
     quotechar: str | None
diff --git a/mypy/typeshed/stdlib/fcntl.pyi b/mypy/typeshed/stdlib/fcntl.pyi
index c17f31c4bebe..dff4ae50277d 100644
--- a/mypy/typeshed/stdlib/fcntl.pyi
+++ b/mypy/typeshed/stdlib/fcntl.pyi
@@ -121,6 +121,9 @@ if sys.platform != "win32":
         RWH_WRITE_LIFE_LONG: Final = 4
         RWH_WRITE_LIFE_EXTREME: Final = 5
 
+    if sys.version_info >= (3, 14) and sys.platform == "linux":
+        F_DUPFD_QUERY: Final[int]
+
     if sys.version_info >= (3, 11) and sys.platform == "darwin":
         F_OFD_SETLK: Final = 90
         F_OFD_SETLKW: Final = 91
diff --git a/mypy/typeshed/stdlib/tarfile.pyi b/mypy/typeshed/stdlib/tarfile.pyi
index c7526d392a42..5def3717a0a2 100644
--- a/mypy/typeshed/stdlib/tarfile.pyi
+++ b/mypy/typeshed/stdlib/tarfile.pyi
@@ -334,7 +334,7 @@ class TarFile:
         pax_headers: Mapping[str, str] | None = ...,
         debug: Literal[0, 1, 2, 3] | None = None,  # default 0
         errorlevel: Literal[0, 1, 2] | None = None,  # default 1
-        preset: Literal[0, 1, 2, 3, 4, 5, 6, 7, 8, 9] | None = ...,
+        preset: int | None = ...,
     ) -> Self: ...
     @overload
     @classmethod
@@ -354,7 +354,7 @@ class TarFile:
         pax_headers: Mapping[str, str] | None = ...,
         debug: Literal[0, 1, 2, 3] | None = None,  # default 0
         errorlevel: Literal[0, 1, 2] | None = None,  # default 1
-        preset: Literal[0, 1, 2, 3, 4, 5, 6, 7, 8, 9] | None = ...,
+        preset: int | None = ...,
     ) -> Self: ...
     if sys.version_info >= (3, 14):
         @overload