diff --git a/sphinxcontrib/qthelp/__init__.py b/sphinxcontrib/qthelp/__init__.py
index a84b788..bdd32e5 100644
--- a/sphinxcontrib/qthelp/__init__.py
+++ b/sphinxcontrib/qthelp/__init__.py
@@ -8,13 +8,15 @@
     :license: BSD, see LICENSE for details.
 """
 
+from __future__ import annotations
+
 import html
 import os
 import posixpath
 import re
 from os import path
 from pathlib import Path
-from typing import Any, Dict, Iterable, List, Tuple, cast
+from typing import TYPE_CHECKING, Any, cast
 
 from docutils import nodes
 from docutils.nodes import Node
@@ -28,6 +30,9 @@
 from sphinx.util.osutil import canon_path, make_filename
 from sphinx.util.template import SphinxRenderer
 
+if TYPE_CHECKING:
+    from collections.abc import Iterable
+
 __version__ = '1.0.4'
 __version_info__ = (1, 0, 4)
 
@@ -83,7 +88,7 @@ def init(self) -> None:
         self.link_suffix = '.html'
         # self.config.html_style = 'traditional.css'
 
-    def get_theme_config(self) -> Tuple[str, Dict]:
+    def get_theme_config(self) -> tuple[str, dict]:
         return self.config.qthelp_theme, self.config.qthelp_theme_options
 
     def handle_finish(self) -> None:
@@ -165,8 +170,8 @@ def isdocnode(self, node: Node) -> bool:
             return False
         return True
 
-    def write_toc(self, node: Node, indentlevel: int = 4) -> List[str]:
-        parts = []  # type: List[str]
+    def write_toc(self, node: Node, indentlevel: int = 4) -> list[str]:
+        parts: list[str] = []
         if isinstance(node, nodes.list_item) and self.isdocnode(node):
             compact_paragraph = cast(addnodes.compact_paragraph, node[0])
             reference = cast(nodes.reference, compact_paragraph[0])
@@ -221,8 +226,8 @@ def keyword_item(self, name: str, ref: Any) -> str:
         item.encode('ascii', 'xmlcharrefreplace')
         return item
 
-    def build_keywords(self, title: str, refs: List[Any], subitems: Any) -> List[str]:
-        keywords = []  # type: List[str]
+    def build_keywords(self, title: str, refs: list[Any], subitems: Any) -> list[str]:
+        keywords: list[str] = []
 
         # if len(refs) == 0: # XXX
         #     write_param('See Also', title)
@@ -243,7 +248,7 @@ def build_keywords(self, title: str, refs: List[Any], subitems: Any) -> List[str
 
         return keywords
 
-    def get_project_files(self, outdir: Path) -> List[str]:
+    def get_project_files(self, outdir: Path) -> list[str]:
         project_files = []
         staticdir = path.join(outdir, '_static')
         imagesdir = path.join(outdir, self.imagedir)
@@ -257,7 +262,7 @@ def get_project_files(self, outdir: Path) -> List[str]:
         return project_files
 
 
-def setup(app: Sphinx) -> Dict[str, Any]:
+def setup(app: Sphinx) -> dict[str, Any]:
     app.setup_extension('sphinx.builders.html')
     app.add_builder(QtHelpBuilder)
     app.add_message_catalog(__name__, path.join(package_dir, 'locales'))