diff --git a/lxml-stubs/_types.pyi b/lxml-stubs/_types.pyi
index fdee512..20ba0c6 100644
--- a/lxml-stubs/_types.pyi
+++ b/lxml-stubs/_types.pyi
@@ -1,3 +1,4 @@
+import sys
 from _typeshed import SupportsRead, SupportsWrite, _KT_co, _VT_co
 from os import PathLike
 from typing import (
@@ -10,7 +11,11 @@ from typing import (
     Protocol,
     TypeVar,
 )
-from typing_extensions import TypeAlias
+
+if sys.version_info >= (3, 10):
+    from typing import TypeAlias
+else:
+    from typing_extensions import TypeAlias
 
 from .etree import QName, _Element, _ElementTree
 
diff --git a/lxml-stubs/etree/_docloader.pyi b/lxml-stubs/etree/_docloader.pyi
index e081dd6..4a89252 100644
--- a/lxml-stubs/etree/_docloader.pyi
+++ b/lxml-stubs/etree/_docloader.pyi
@@ -1,7 +1,12 @@
+import sys
 from _typeshed import SupportsRead
 from abc import ABCMeta, abstractmethod
 from typing import Any, final, type_check_only
-from typing_extensions import Self
+
+if sys.version_info >= (3, 11):
+    from typing import Self
+else:
+    from typing_extensions import Self
 
 from .._types import _AnyStr
 
diff --git a/lxml-stubs/etree/_element.pyi b/lxml-stubs/etree/_element.pyi
index 7705c28..c0505f1 100644
--- a/lxml-stubs/etree/_element.pyi
+++ b/lxml-stubs/etree/_element.pyi
@@ -1,6 +1,16 @@
+import sys
 from _typeshed import _T
 from typing import Any, Generic, Iterable, Iterator, Literal, Mapping, overload
-from typing_extensions import Never, Self, deprecated
+
+if sys.version_info >= (3, 11):
+    from typing import Never, Self
+else:
+    from typing_extensions import Never, Self
+
+if sys.version_info >= (3, 13):
+    from typing import deprecated
+else:
+    from typing_extensions import deprecated
 
 from .. import _types as _t
 from ..cssselect import _CSSTransArg
@@ -318,8 +328,9 @@ class _ElementTree(Generic[_t._ET_co]):
         self,
         _xslt: _t._ElementOrTree,
         /,
-        extensions: _t.SupportsLaxedItems[tuple[_t._AnyStr, _t._AnyStr], XSLTExtension]
-        | None = ...,
+        extensions: (
+            _t.SupportsLaxedItems[tuple[_t._AnyStr, _t._AnyStr], XSLTExtension] | None
+        ) = ...,
         access_control: XSLTAccessControl | None = ...,
         *,  # all keywords are passed to XSLT.__call__
         profile_run: bool = ...,
@@ -354,9 +365,11 @@ class _Attrib:
     # explicitly checks for dict and _Attrib
     def update(
         self,
-        sequence_or_dict: _Attrib
-        | dict[Any, Any]  # Compromise with MutableMapping key/val invariance
-        | Iterable[tuple[_t._AttrName, _t._AttrVal]],
+        sequence_or_dict: (
+            _Attrib
+            | dict[Any, Any]  # Compromise with MutableMapping key/val invariance
+            | Iterable[tuple[_t._AttrName, _t._AttrVal]]
+        ),
     ) -> None: ...
     # Signature is pop(self, key, *default), yet followed by runtime
     # check and raise exception if multiple default argument is supplied
diff --git a/lxml-stubs/etree/_iterparse.pyi b/lxml-stubs/etree/_iterparse.pyi
index 0fdfcb0..c98b7da 100644
--- a/lxml-stubs/etree/_iterparse.pyi
+++ b/lxml-stubs/etree/_iterparse.pyi
@@ -1,6 +1,16 @@
+import sys
 from _typeshed import SupportsRead, _T_co
 from typing import IO, Iterable, Iterator, Literal, overload
-from typing_extensions import LiteralString, TypeAlias
+
+if sys.version_info >= (3, 10):
+    from typing import TypeAlias
+else:
+    from typing_extensions import TypeAlias
+
+if sys.version_info >= (3, 11):
+    from typing import LiteralString
+else:
+    from typing_extensions import LiteralString
 
 from .._types import (
     SupportsLaxedItems,
diff --git a/lxml-stubs/etree/_module_func.pyi b/lxml-stubs/etree/_module_func.pyi
index 8fa09f4..1b49cb6 100644
--- a/lxml-stubs/etree/_module_func.pyi
+++ b/lxml-stubs/etree/_module_func.pyi
@@ -1,5 +1,15 @@
+import sys
 from typing import Any, Iterable, Literal, final, overload
-from typing_extensions import TypeGuard, deprecated
+
+if sys.version_info >= (3, 10):
+    from typing import TypeGuard
+else:
+    from typing_extensions import TypeGuard
+
+if sys.version_info >= (3, 13):
+    from typing import deprecated
+else:
+    from typing_extensions import deprecated
 
 from .._types import (
     _ET,
diff --git a/lxml-stubs/etree/_module_misc.pyi b/lxml-stubs/etree/_module_misc.pyi
index 7d7fb19..ffad172 100644
--- a/lxml-stubs/etree/_module_misc.pyi
+++ b/lxml-stubs/etree/_module_misc.pyi
@@ -2,9 +2,14 @@
 # lxml.etree helper classes, exceptions and constants
 #
 
+import sys
 from abc import ABCMeta, abstractmethod
 from typing import overload
-from typing_extensions import LiteralString
+
+if sys.version_info >= (3, 11):
+    from typing import LiteralString
+else:
+    from typing_extensions import LiteralString
 
 from .._types import _AnyStr, _ElementOrTree, _TagName
 from ._dtd import DTD
diff --git a/lxml-stubs/etree/_nsclasses.pyi b/lxml-stubs/etree/_nsclasses.pyi
index 51d30f6..b2d3dca 100644
--- a/lxml-stubs/etree/_nsclasses.pyi
+++ b/lxml-stubs/etree/_nsclasses.pyi
@@ -1,3 +1,4 @@
+import sys
 from _typeshed import _KT, _T, _VT
 from typing import (
     Any,
@@ -9,7 +10,11 @@ from typing import (
     final,
     overload,
 )
-from typing_extensions import ParamSpec
+
+if sys.version_info >= (3, 10):
+    from typing import ParamSpec
+else:
+    from typing_extensions import ParamSpec
 
 from .._types import SupportsLaxedItems
 from ._classlookup import ElementBase, ElementClassLookup, FallbackElementClassLookup
diff --git a/lxml-stubs/etree/_parser.pyi b/lxml-stubs/etree/_parser.pyi
index 6b42aa3..f2f8463 100644
--- a/lxml-stubs/etree/_parser.pyi
+++ b/lxml-stubs/etree/_parser.pyi
@@ -1,6 +1,16 @@
+import sys
 from _typeshed import _T
 from typing import Any, Generic, Iterable, Iterator
-from typing_extensions import LiteralString, Self, deprecated
+
+if sys.version_info >= (3, 11):
+    from typing import LiteralString, Self
+else:
+    from typing_extensions import LiteralString, Self
+
+if sys.version_info >= (3, 13):
+    from typing import deprecated
+else:
+    from typing_extensions import deprecated
 
 from .._types import (
     SupportsLaxedItems,
@@ -84,6 +94,7 @@ class _FeedParser(Generic[_ET_co]):
         ```
         """
         ...
+
     @deprecated(
         "Removed since 5.0; deprecated since v2.0 (2008); renamed to set_element_class_lookup()"
     )
diff --git a/lxml-stubs/etree/_xmlid.pyi b/lxml-stubs/etree/_xmlid.pyi
index 917221f..9348e5d 100644
--- a/lxml-stubs/etree/_xmlid.pyi
+++ b/lxml-stubs/etree/_xmlid.pyi
@@ -1,5 +1,10 @@
+import sys
 from typing import Collection, Generic, Iterator, overload
-from typing_extensions import Self
+
+if sys.version_info >= (3, 11):
+    from typing import Self
+else:
+    from typing_extensions import Self
 
 from .._types import _ET, _AnyStr, _FileReadSource
 from ._element import _Element, _ElementTree
diff --git a/lxml-stubs/etree/_xpath.pyi b/lxml-stubs/etree/_xpath.pyi
index b156517..bf821b2 100644
--- a/lxml-stubs/etree/_xpath.pyi
+++ b/lxml-stubs/etree/_xpath.pyi
@@ -3,9 +3,14 @@
 # etree/_extension.pxi are merged here.
 #
 
+import sys
 from abc import abstractmethod
 from typing import Any, Callable, Generic, Mapping, Protocol, final, overload
-from typing_extensions import deprecated
+
+if sys.version_info >= (3, 13):
+    from typing import deprecated
+else:
+    from typing_extensions import deprecated
 
 from .._types import (
     _ET,
diff --git a/lxml-stubs/etree/_xslt.pyi b/lxml-stubs/etree/_xslt.pyi
index 71f5ef0..22bfda9 100644
--- a/lxml-stubs/etree/_xslt.pyi
+++ b/lxml-stubs/etree/_xslt.pyi
@@ -3,8 +3,18 @@
 #
 
 import abc
-from typing import Any, ClassVar, Literal, final, overload
-from typing_extensions import TypeAlias, TypedDict, deprecated
+import sys
+from typing import Any, ClassVar, Literal, TypedDict, final, overload
+
+if sys.version_info >= (3, 10):
+    from typing import TypeAlias
+else:
+    from typing_extensions import TypeAlias
+
+if sys.version_info >= (3, 13):
+    from typing import deprecated
+else:
+    from typing_extensions import deprecated
 
 from .._types import SupportsLaxedItems, _AnyStr, _ElementOrTree, _FileWriteSource
 from ._classlookup import PIBase
@@ -46,6 +56,7 @@ class _XSLTResultTree(_ElementTree[_Element]):
         As opposed to the generic ``.write()`` method, ``.write_output()`` serialises
         the result as defined by the ``<xsl:output>`` tag.
         """
+
     @property
     def xslt_profile(self) -> _ElementTree[_Element] | None:
         """Return an ElementTree with profiling data for the stylesheet run"""
@@ -128,8 +139,9 @@ class XSLT:
     def __init__(
         self,
         xslt_input: _ElementOrTree,
-        extensions: SupportsLaxedItems[tuple[_AnyStr, _AnyStr], XSLTExtension]
-        | None = ...,
+        extensions: (
+            SupportsLaxedItems[tuple[_AnyStr, _AnyStr], XSLTExtension] | None
+        ) = ...,
         regexp: bool = ...,
         access_control: XSLTAccessControl | None = ...,
     ) -> None: ...
@@ -197,6 +209,7 @@ class XSLTExtension(metaclass=abc.ABCMeta):
         is no parent element in the current context (e.g. no content
         was added to the output tree yet).
         """
+
     @overload
     def apply_templates(
         self,
@@ -247,6 +260,7 @@ class XSLTExtension(metaclass=abc.ABCMeta):
         Note that the string discarding options will be ignored in this
         case.
         """
+
     @overload
     def process_children(
         self,
diff --git a/lxml-stubs/html/__init__.pyi b/lxml-stubs/html/__init__.pyi
index 57c2c23..7b1d8d8 100644
--- a/lxml-stubs/html/__init__.pyi
+++ b/lxml-stubs/html/__init__.pyi
@@ -1,4 +1,9 @@
-from typing_extensions import LiteralString
+import sys
+
+if sys.version_info >= (3, 11):
+    from typing import LiteralString
+else:
+    from typing_extensions import LiteralString
 
 from ._element import (
     Classes as Classes,
diff --git a/lxml-stubs/html/_element.pyi b/lxml-stubs/html/_element.pyi
index 5f78da8..81d79b7 100644
--- a/lxml-stubs/html/_element.pyi
+++ b/lxml-stubs/html/_element.pyi
@@ -1,6 +1,11 @@
+import sys
 from _typeshed import _T
 from typing import Callable, Iterable, Iterator, Literal, MutableSet, overload
-from typing_extensions import Self
+
+if sys.version_info >= (3, 11):
+    from typing import Self
+else:
+    from typing_extensions import Self
 
 from .. import etree
 from .._types import (
diff --git a/lxml-stubs/html/_form.pyi b/lxml-stubs/html/_form.pyi
index 58b7d1b..db51e4d 100644
--- a/lxml-stubs/html/_form.pyi
+++ b/lxml-stubs/html/_form.pyi
@@ -1,3 +1,4 @@
+import sys
 from typing import (
     Any,
     Callable,
@@ -7,7 +8,16 @@ from typing import (
     MutableMapping,
     MutableSet,
 )
-from typing_extensions import Never, TypeAlias
+
+if sys.version_info >= (3, 10):
+    from typing import TypeAlias
+else:
+    from typing_extensions import TypeAlias
+
+if sys.version_info >= (3, 11):
+    from typing import Never
+else:
+    from typing_extensions import Never
 
 from .._types import SupportsLaxedItems, _AnyStr
 from ._element import HtmlElement
diff --git a/lxml-stubs/html/_funcs.pyi b/lxml-stubs/html/_funcs.pyi
index 9b202b2..ce6c389 100644
--- a/lxml-stubs/html/_funcs.pyi
+++ b/lxml-stubs/html/_funcs.pyi
@@ -1,12 +1,17 @@
+import sys
 from typing import AnyStr, Callable, Iterator, Literal, TypeVar, overload
-from typing_extensions import TypeAlias
 
-from .. import etree
+if sys.version_info >= (3, 10):
+    from typing import TypeAlias
+else:
+    from typing_extensions import TypeAlias
+
 from .._types import _AnyStr, _OutputMethodArg
+from ..etree import _ElementTree
 from ._element import _HANDLE_FAILURES, HtmlElement
 
 _HtmlDoc_T = TypeVar("_HtmlDoc_T", str, bytes, HtmlElement)
-_HtmlElemOrTree: TypeAlias = HtmlElement | etree._ElementTree[HtmlElement]
+_HtmlElemOrTree: TypeAlias = HtmlElement | _ElementTree[HtmlElement]
 
 # These are HtmlMixin methods converted to standard functions,
 # with element or HTML string as first argument followed by all
diff --git a/lxml-stubs/html/_parse.pyi b/lxml-stubs/html/_parse.pyi
index a785394..8487325 100644
--- a/lxml-stubs/html/_parse.pyi
+++ b/lxml-stubs/html/_parse.pyi
@@ -1,5 +1,10 @@
+import sys
 from typing import Any, Iterable, MutableMapping
-from typing_extensions import TypeAlias
+
+if sys.version_info >= (3, 10):
+    from typing import TypeAlias
+else:
+    from typing_extensions import TypeAlias
 
 from .. import etree
 from .._types import Unused, _AnyStr, _ElemClsLookupArg, _FileReadSource
diff --git a/lxml-stubs/html/clean.pyi b/lxml-stubs/html/clean.pyi
index 37199b4..7843ea1 100644
--- a/lxml-stubs/html/clean.pyi
+++ b/lxml-stubs/html/clean.pyi
@@ -1,5 +1,10 @@
+import sys
 from typing import Iterable, Pattern, TypeVar, Union, overload
-from typing_extensions import TypeAlias
+
+if sys.version_info >= (3, 10):
+    from typing import TypeAlias
+else:
+    from typing_extensions import TypeAlias
 
 from .._types import Unused, _ElemFactory
 from ..etree import _Element, _ElementTree
diff --git a/lxml-stubs/isoschematron.pyi b/lxml-stubs/isoschematron.pyi
index c7a8101..78c8424 100644
--- a/lxml-stubs/isoschematron.pyi
+++ b/lxml-stubs/isoschematron.pyi
@@ -1,5 +1,10 @@
+import sys
 from typing import Any, ClassVar, overload
-from typing_extensions import LiteralString
+
+if sys.version_info >= (3, 11):
+    from typing import LiteralString
+else:
+    from typing_extensions import LiteralString
 
 from . import etree as _e
 from ._types import _ElementOrTree, _FileReadSource
diff --git a/lxml-stubs/objectify/__init__.pyi b/lxml-stubs/objectify/__init__.pyi
index 22acde8..a98fa19 100644
--- a/lxml-stubs/objectify/__init__.pyi
+++ b/lxml-stubs/objectify/__init__.pyi
@@ -1,4 +1,9 @@
-from typing_extensions import LiteralString
+import sys
+
+if sys.version_info >= (3, 11):
+    from typing import LiteralString
+else:
+    from typing_extensions import LiteralString
 
 from ._annotate import (
     PyType as PyType,
diff --git a/lxml-stubs/objectify/_element.pyi b/lxml-stubs/objectify/_element.pyi
index 365daf5..da3a88b 100644
--- a/lxml-stubs/objectify/_element.pyi
+++ b/lxml-stubs/objectify/_element.pyi
@@ -3,13 +3,19 @@
 #
 
 import abc
+import sys
 from typing import Any, Callable, Iterable, Iterator, Literal, overload
-from typing_extensions import LiteralString, Self, SupportsIndex
+from typing_extensions import SupportsIndex
+
+if sys.version_info >= (3, 11):
+    from typing import LiteralString, Self
+else:
+    from typing_extensions import LiteralString, Self
 
-from .. import etree
 from .._types import _AnyStr, _TagName
+from ..etree import CDATA, ElementBase
 
-class ObjectifiedElement(etree.ElementBase):
+class ObjectifiedElement(ElementBase):
     """Main XML Element class
 
     Original Docstring
@@ -75,7 +81,7 @@ class ObjectifiedDataElement(ObjectifiedElement):
     @property
     @abc.abstractmethod
     def pyval(self) -> Any: ...
-    def _setText(self, s: _AnyStr | etree.CDATA | None) -> None:
+    def _setText(self, s: _AnyStr | CDATA | None) -> None:
         """Modify text content of objectified element directly.
 
         Original Docstring
@@ -83,6 +89,7 @@ class ObjectifiedDataElement(ObjectifiedElement):
         For use in subclasses only. Don't use unless you know what you are
         doing.
         """
+
     def _setValueParser(self, function: Callable[[Any], Any]) -> None:
         """Set the function that parses the Python value from a string