diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f74b37b..a3ed276 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,12 +10,11 @@ jobs:
     strategy:
       matrix:
         include:
-        - python: 3.8
-        - python: 3.9
+        - python: '3.9'
         - python: '3.10'
         - python: '3.11'
         - python: '3.12'
-        - python: '3.13-dev'
+        - python: '3.13'
     runs-on: ubuntu-latest
     name: Python ${{ matrix.python }}
     steps:
@@ -40,17 +39,16 @@ jobs:
       run:
         python -m pip install .[dev,mypy]
     - name: run tests with fontconfig
-      run:
+      run: |
+        python -c "from brother_ql_web.font_helpers import _has_fontra; assert not _has_fontra()"
         python -m unittest discover --verbose --start-directory tests
     - name: install fontra
       run:
         python -m pip install .[fontra]
-      if: ${{ matrix.python != '3.8' }}
     - name: run tests with fontra
       run: |
         python -c "from brother_ql_web.font_helpers import _has_fontra; assert _has_fontra()"
         python -m unittest discover --verbose --start-directory tests
-      if: ${{ matrix.python != '3.8' }}
     - name: run flake8
       run:
         python -m flake8
@@ -60,7 +58,6 @@ jobs:
     - name: run mypy
       run:
         mypy brother_ql_web/ tests/
-      if: ${{ matrix.python != '3.8' }}
     - name: codespell
       run:
         codespell --skip "*.min.js*,*.min.css*" * .github
diff --git a/brother_ql_web/labels.py b/brother_ql_web/labels.py
index d420bca..163c180 100644
--- a/brother_ql_web/labels.py
+++ b/brother_ql_web/labels.py
@@ -3,11 +3,7 @@
 import logging
 from dataclasses import dataclass
 from io import BytesIO
-from typing import (
-    cast,
-    Literal,
-    Tuple,
-)  # TODO: Remove `Tuple` after dropping Python 3.8.
+from typing import cast, Literal
 
 from brother_ql import BrotherQLRaster, create_label
 from brother_ql.devicedependent import (
@@ -94,7 +90,7 @@ def font_path(self) -> str:
     def width_height(self) -> Tuple[int, int]:
         try:
             width, height = cast(
-                Tuple[int, int], label_type_specs[self.label_size]["dots_printable"]
+                tuple[int, int], label_type_specs[self.label_size]["dots_printable"]
             )
         except KeyError:
             raise LookupError("Unknown label_size")
@@ -116,7 +112,7 @@ def height(self) -> int:
 
 def _determine_image_dimensions(
     text: str, image_font: ImageFont.FreeTypeFont, parameters: LabelParameters
-) -> Tuple[int, int, int, int]:
+) -> tuple[int, int, int, int]:
     image = Image.new("L", (20, 20), "white")
     draw = ImageDraw.Draw(image)
 
@@ -148,7 +144,7 @@ def _determine_text_offsets(
     text_height: int,
     text_width: int,
     parameters: LabelParameters,
-) -> Tuple[int, int]:
+) -> tuple[int, int]:
     if parameters.orientation == "standard":
         if parameters.kind in (DIE_CUT_LABEL, ROUND_DIE_CUT_LABEL):
             vertical_offset = (height - text_height) // 2
diff --git a/brother_ql_web/web.py b/brother_ql_web/web.py
index ce20a1e..8ebefd8 100644
--- a/brother_ql_web/web.py
+++ b/brother_ql_web/web.py
@@ -3,7 +3,7 @@
 import logging
 from io import BytesIO
 from pathlib import Path
-from typing import Any, cast, Dict  # TODO: Remove `Dict` after dropping Python 3.8.
+from typing import Any, cast
 
 import bottle
 from brother_ql import BrotherQLRaster
@@ -42,7 +42,7 @@ def serve_static(filename: str) -> bottle.HTTPResponse:
 @bottle.route("/labeldesigner")  # type: ignore[misc]
 @bottle.jinja2_view("labeldesigner.jinja2")  # type: ignore[misc]
 def labeldesigner() -> dict[str, Any]:
-    fonts = cast(Dict[str, Dict[str, str]], get_config("brother_ql_web.fonts"))
+    fonts = cast(dict[str, dict[str, str]], get_config("brother_ql_web.fonts"))
     font_family_names = sorted(list(fonts.keys()))
     configuration = cast(Configuration, get_config("brother_ql_web.configuration"))
     return {
diff --git a/pyproject.toml b/pyproject.toml
index 43c2e09..ce386ac 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,7 @@ keywords = [
     "label",
     "printer",
 ]
-requires-python = ">=3.8, <4"
+requires-python = ">=3.9, <4"
 dependencies = [
     "brother_ql",
     "bottle",
@@ -62,7 +62,6 @@ dev = [
     "pep8-naming",
     "flake8-bugbear",
     "requests",
-    "importlib-resources; python_version < '3.9'",
 ]
 mypy = [
     "mypy",
diff --git a/tests/test_labels.py b/tests/test_labels.py
index 6fd56a1..7ce2ff5 100644
--- a/tests/test_labels.py
+++ b/tests/test_labels.py
@@ -1,9 +1,6 @@
 from __future__ import annotations
 
-try:
-    from importlib.resources import as_file, files
-except ImportError:
-    from importlib_resources import as_file, files  # type: ignore[import-not-found,no-redef]  # noqa: E501
+from importlib.resources import as_file, files
 from tempfile import NamedTemporaryFile
 from unittest import mock
 
diff --git a/tests/test_web.py b/tests/test_web.py
index 19c8baa..8036e24 100644
--- a/tests/test_web.py
+++ b/tests/test_web.py
@@ -1,12 +1,9 @@
 from __future__ import annotations
 
-try:
-    from importlib.resources import as_file, files
-except ImportError:
-    from importlib_resources import as_file, files  # type: ignore[import-not-found,no-redef]  # noqa: E501
 import base64
 import os
 import subprocess
+from importlib.resources import as_file, files
 from tempfile import NamedTemporaryFile
 from threading import Thread
 from time import sleep