diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d0ca94d..28c6e1e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -14,19 +14,28 @@ on:
 
 jobs:
   build:
-    name: Python ${{ matrix.python-version }}
-    runs-on: ubuntu-latest
+    name: Python ${{ matrix.python-version }} on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
 
     strategy:
       matrix:
         python-version:
-          - "3.8"
-          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
           - "3.13"
-          - "pypy3.10"
+          - "3.14"
+        os:
+          - ubuntu-latest
+          - windows-latest
+        include:
+          # pypy3.10 on windows-latest fails one test, which I've briefly
+          # investigated and I think it's a bug in pypy -- the generator uses a
+          # with statement and closes the file before terminating, and the test
+          # uses the generator in a for loop, so it should guarantee
+          # termination and close the file before the cleanup code runs.
+          - python-version: "pypy3.10"
+            os: ubuntu-latest
 
     steps:
       - name: Git clone
@@ -36,22 +45,16 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: "${{ matrix.python-version }}"
-
-      - name: Pip cache
-        uses: actions/cache@v4
-        with:
-          path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('setup.py') }}
-          restore-keys: |
-            ${{ runner.os }}-pip-${{ matrix.python-version }}-
-            ${{ runner.os }}-pip-
+          cache: pip
+          cache-dependency-path: |
+            setup.py
 
       - name: Install dependencies
         run: |
           python -m pip install -U pip
           python -m pip install -U setuptools wheel
           python -m pip install -U zope.testrunner coverage coveralls
-          python -m pip install -e .[test]
+          python -m pip install -e '.[test]'
 
       - name: Run tests
         run: coverage run -m zope.testrunner --test-path=src
diff --git a/CHANGES.rst b/CHANGES.rst
index 004cf15..b7624f6 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,10 +1,12 @@
 Changelog
 =========
 
-4.0.1 (unreleased)
+4.1.0 (unreleased)
 ------------------
 
-- Drop support for Python 3.7.
+- Add support for Python 3.14.
+
+- Drop support for Python 3.7, 3.8, and 3.9.
 
 
 4.0.0 (2024-10-17)
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index 3461342..0000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,32 +0,0 @@
-version: build-{build}-{branch}
-
-environment:
-  matrix:
-    # https://www.appveyor.com/docs/installed-software#python lists available
-    # versions
-    - PYTHON: "C:\\Python38"
-    - PYTHON: "C:\\Python39"
-    - PYTHON: "C:\\Python310"
-    - PYTHON: "C:\\Python311"
-    - PYTHON: "C:\\Python312"
-    - PYTHON: "C:\\Python313"
-
-init:
-  - "echo %PYTHON%"
-
-install:
-  - ps: |
-      if (-not (Test-Path $env:PYTHON)) {
-        curl -o install_python.ps1 https://raw.githubusercontent.com/matthew-brett/multibuild/11a389d78892cf90addac8f69433d5e22bfa422a/install_python.ps1
-        .\install_python.ps1
-      }
-  - ps: if (-not (Test-Path $env:PYTHON)) { throw "No $env:PYTHON" }
-  - "set PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
-  - python --version
-  - pip install -U virtualenv  # upgrade pip in tox's virtualenvs
-  - pip install tox
-
-build: off
-
-test_script:
-  - tox -e py
diff --git a/setup.py b/setup.py
index a21079b..9627206 100755
--- a/setup.py
+++ b/setup.py
@@ -38,16 +38,15 @@ def read(filename):
         'License :: OSI Approved :: GNU General Public License v2 (GPLv2)',
         'License :: OSI Approved :: GNU General Public License v3 (GPLv3)',
         'Operating System :: OS Independent',
-        'Programming Language :: Python :: 3.8',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
         'Programming Language :: Python :: 3.13',
+        'Programming Language :: Python :: 3.14',
         'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: Python :: Implementation :: PyPy',
     ],
-    python_requires='>=3.8',
+    python_requires='>=3.10',
     keywords='irc log colorizer html wsgi',
     extras_require=dict(test=[
         "zope.testing",
diff --git a/src/irclog2html/_version.py b/src/irclog2html/_version.py
index 7afa50b..53d9d97 100644
--- a/src/irclog2html/_version.py
+++ b/src/irclog2html/_version.py
@@ -1,3 +1,3 @@
-__version__ = '4.0.1.dev0'
-__date__ = '2024-10-17'
+__version__ = '4.1.0.dev0'
+__date__ = '2025-11-06'
 __homepage__ = 'https://mg.pov.lt/irclog2html/'
diff --git a/tox.ini b/tox.ini
index 95b1cd5..04af5fa 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py38, py39, py310, py311, py312, py313, pypy3, flake8
+envlist = py310, py311, py312, py313, py314, pypy3, flake8
 
 [testenv]
 deps =