diff --git a/.github/workflows/container.yml b/.github/workflows/container.yml
index a51b52a..e70fab4 100644
--- a/.github/workflows/container.yml
+++ b/.github/workflows/container.yml
@@ -16,27 +16,27 @@ jobs:
       packages: write
 
     steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
+    - name: Checkout repository
+      uses: actions/checkout@v4
 
-      - name: Log in to the Container registry
-        uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567
-        with:
-          registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+    - name: Log in to the Container registry
+      uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567
+      with:
+        registry: ${{ env.REGISTRY }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Extract metadata (tags, labels) for Docker
-        id: meta
-        uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81
-        with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}{% raw %}
+    - name: Extract metadata (tags, labels) for Docker
+      id: meta
+      uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81
+      with:
+        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}{% raw %}
 
-      - name: Build and push Docker image
-        uses: docker/build-push-action@4f58ea79222b3b9dc2c8bbdd6debcef730109a75
-        with:
-          context: .
-          push: true
-          tags: |
-            ghcr.io/jelmer/prometheus-xmpp-alerts:latest
-          labels: ${{ steps.meta.outputs.labels }}
+    - name: Build and push Docker image
+      uses: docker/build-push-action@4f58ea79222b3b9dc2c8bbdd6debcef730109a75
+      with:
+        context: .
+        push: true
+        tags: |
+          ghcr.io/jelmer/prometheus-xmpp-alerts:latest
+        labels: ${{ steps.meta.outputs.labels }}
diff --git a/.github/workflows/disperse.yml b/.github/workflows/disperse.yml
index c5e2cd7..13b2536 100644
--- a/.github/workflows/disperse.yml
+++ b/.github/workflows/disperse.yml
@@ -1,8 +1,7 @@
----
 name: Disperse configuration
 
 "on":
-  - push
+- push
 
 jobs:
   build:
@@ -10,5 +9,5 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
-      - uses: jelmer/action-disperse-validate@v1
+    - uses: actions/checkout@v4
+    - uses: jelmer/action-disperse-validate@v1
diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index c95ae77..71879bc 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -9,33 +9,38 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [3.8, 3.9, "3.10", "3.11", "3.12", "3.13"]
+        python-version:
+        - '3.13'
+        - '3.12'
+        - '3.11'
+        - '3.10'
+        - '3.9'
         exclude:
           # There is no pyyaml wheel on macos-latest/3.9
-          - os: macos-latest
-            python-version: "3.9"
+        - os: macos-latest
+          python-version: "3.9"
       fail-fast: false
 
     steps:
-      - uses: actions/checkout@v4
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          python -m pip install ".[dev]"
-      - name: Style checks
-        run: |
-          python -m ruff check .
-      - name: Typing checks
-        run: |
-          pip install -U mypy types-pytz types-jinja2 types-PyYAML
-          python -m mypy --ignore-missing-imports prometheus_xmpp
-      - name: Test suite run
-        run: |
-          python -m pip install ".[testing]"
-          python -m unittest tests.test_suite
-        env:
-          PYTHONHASHSEED: random
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install ".[dev]"
+    - name: Style checks
+      run: |
+        python -m ruff check .
+    - name: Typing checks
+      run: |
+        pip install -U mypy types-pytz types-jinja2 types-PyYAML
+        python -m mypy --ignore-missing-imports prometheus_xmpp
+    - name: Test suite run
+      run: |
+        python -m pip install ".[testing]"
+        python -m unittest tests.test_suite
+      env:
+        PYTHONHASHSEED: random
diff --git a/.github/workflows/wheels.yaml b/.github/workflows/wheels.yaml
index 75f27c2..4976b1d 100644
--- a/.github/workflows/wheels.yaml
+++ b/.github/workflows/wheels.yaml
@@ -4,7 +4,7 @@ on:
   push:
   pull_request:
   schedule:
-    - cron: "0 6 * * *" # Daily 6AM UTC build
+  - cron: "0 6 * * *"   # Daily 6AM UTC build
 
 jobs:
   build-wheels:
@@ -15,62 +15,62 @@ jobs:
       fail-fast: true
 
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install build
-      - name: Build wheels
-        run: python -m build --wheel
-      - name: Upload wheels
-        uses: actions/upload-artifact@v4
-        with:
-          name: artifact-${{ matrix.os }}
-          path: ./dist/*.whl
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install build
+    - name: Build wheels
+      run: python -m build --wheel
+    - name: Upload wheels
+      uses: actions/upload-artifact@v4
+      with:
+        name: artifact-${{ matrix.os }}
+        path: ./dist/*.whl
 
   build-sdist:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install build
-      - name: Build sdist
-        run: python -m build --sdist
-      - name: Upload sdist
-        uses: actions/upload-artifact@v4
-        with:
-          name: artifact-source
-          path: ./dist/*.tar.gz
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install build
+    - name: Build sdist
+      run: python -m build --sdist
+    - name: Upload sdist
+      uses: actions/upload-artifact@v4
+      with:
+        name: artifact-source
+        path: ./dist/*.tar.gz
 
   test-sdist:
     needs:
-      - build-sdist
+    - build-sdist
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-python@v5
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install twine
-      - name: Download sdist
-        uses: actions/download-artifact@v4
-        with:
-          name: artifact-source
-          path: dist
-      - name: Test sdist
-        run: twine check dist/*
-      - name: Test installation from sdist
-        run: pip install dist/*.tar.gz
+    - uses: actions/setup-python@v5
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install twine
+    - name: Download sdist
+      uses: actions/download-artifact@v4
+      with:
+        name: artifact-source
+        path: dist
+    - name: Test sdist
+      run: twine check dist/*
+    - name: Test installation from sdist
+      run: pip install dist/*.tar.gz
 
   publish:
     runs-on: ubuntu-latest
     needs:
-      - build-wheels
-      - build-sdist
+    - build-wheels
+    - build-sdist
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v')
     permissions:
       id-token: write
@@ -78,11 +78,11 @@ jobs:
       name: pypi
       url: https://pypi.org/p/prometheus-xmpp-alerts
     steps:
-      - name: Download distributions
-        uses: actions/download-artifact@v4
-        with:
-          merge-multiple: true
-          pattern: artifact-*
-          path: dist
-      - name: Publish package distributions to PyPI
-        uses: pypa/gh-action-pypi-publish@release/v1
+    - name: Download distributions
+      uses: actions/download-artifact@v4
+      with:
+        merge-multiple: true
+        pattern: artifact-*
+        path: dist
+    - name: Publish package distributions to PyPI
+      uses: pypa/gh-action-pypi-publish@release/v1
diff --git a/pyproject.toml b/pyproject.toml
index c29f377..3d2f64a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,7 @@ classifiers = [
     "Operating System :: POSIX",
     "Operating System :: Microsoft :: Windows",
 ]
-requires-python = ">= 3.8"
+requires-python = ">=3.9"
 dependencies = [
     "slixmpp",
     "aiohttp",