diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index bc676bb..a84ca91 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -9,6 +9,14 @@ updates:
     schedule:
       interval: "daily"
 
+  # For `ci/latest/requirements.txt`, used in unit-test-latest.yml
+  - package-ecosystem: "pip"
+    directory: "/ci/latest"
+    schedule:
+      interval: "daily"
+
+  # Note: `ci/minimum/requirements.txt` is not updated by Dependabot.
+
   #
   - package-ecosystem: "github-actions"
     directory: "/"
diff --git a/.github/workflows/type-check.yml b/.github/workflows/type-check.yml
index 9fc8256..4602166 100644
--- a/.github/workflows/type-check.yml
+++ b/.github/workflows/type-check.yml
@@ -3,10 +3,10 @@ name: Check static types
 on:
   push:
     branches:
-      - "**"
+      - main
   pull_request:
     branches:
-      - "**"
+      - main
 
 jobs:
   run:
diff --git a/.github/workflows/unit-test-latest.yml b/.github/workflows/unit-test-latest.yml
new file mode 100644
index 0000000..085b085
--- /dev/null
+++ b/.github/workflows/unit-test-latest.yml
@@ -0,0 +1,48 @@
+name: Run unit tests with latest dependency versions
+# This workflow runs the unit tests with the latest versions of the
+# dependencies listed in `pyproject.toml`. The latest versions are specified in
+# `ci/latest/requirements.txt`. The `requirements.txt` file is updated by
+# Dependabot.
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+concurrency:
+  group: unit-test-latest-${{ github.head_ref }}
+  cancel-in-progress: true
+
+env:
+  PYTHONUNBUFFERED: "1"
+  FORCE_COLOR: "1"
+
+jobs:
+  run:
+    name: Python ${{ matrix.python-version }} on Linux
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.10", "3.11", "3.12"]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install packages
+        run: |
+          pip install --upgrade pip
+          pip install -e '.[tests]'
+          pip install -r ci/latest/requirements.txt
+          pip list
+
+      - name: Run tests
+        run: pytest -vv --cov --cov-report=xml
diff --git a/.github/workflows/unit-test-min.yml b/.github/workflows/unit-test-min.yml
new file mode 100644
index 0000000..d07d7bf
--- /dev/null
+++ b/.github/workflows/unit-test-min.yml
@@ -0,0 +1,52 @@
+name: Run unit tests with oldest dependency versions
+# This workflow runs the unit tests with the oldest versions of the
+# dependencies listed in `pyproject.toml`. The oldest versions are specified in
+# `ci/minimum/requirements.txt`. The `requirements.txt` file is needs to
+# be manually updated to be aligned with `pyproject.toml`.
+# 
+# In the future, `pip` might be able to install the minimum versions in
+# `pyproject.toml` directly as disscussed in an open issue:
+# https://github.com/pypa/pip/issues/8085
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+concurrency:
+  group: unit-test-min-${{ github.head_ref }}
+  cancel-in-progress: true
+
+env:
+  PYTHONUNBUFFERED: "1"
+  FORCE_COLOR: "1"
+
+jobs:
+  run:
+    name: Python ${{ matrix.python-version }} on Linux
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.10", "3.11", "3.12"]
+
+    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 packages
+        run: |
+          pip install --upgrade pip
+          pip install -e '.[tests]'
+          pip install -r ci/minimum/requirements.txt
+          pip list
+
+      - name: Run tests
+        run: pytest -vv --cov --cov-report=xml
diff --git a/.github/workflows/unit-test.yml b/.github/workflows/unit-test.yml
index 12c2921..5a032f7 100644
--- a/.github/workflows/unit-test.yml
+++ b/.github/workflows/unit-test.yml
@@ -3,10 +3,10 @@ name: Run unit tests
 on:
   push:
     branches:
-      - "**"
+      - main
   pull_request:
     branches:
-      - "**"
+      - main
 
 concurrency:
   group: unit-test-${{ github.head_ref }}
diff --git a/ci/latest/requirements.txt b/ci/latest/requirements.txt
new file mode 100644
index 0000000..7dce3b5
--- /dev/null
+++ b/ci/latest/requirements.txt
@@ -0,0 +1,10 @@
+# The exact requirements of the latest versions of the dependencies. This file
+# is used in a GitHub Actions workflow to test the compatibility with the
+# latest versions of the dependencies. This file is monitored by Dependabot.
+nextline-graphql==0.7.8
+httpx==0.26.0
+pytest-asyncio==0.23.0
+pytest-cov==4.1.0
+pytest-timeout==2.2.0
+pytest==7.4.0
+respx==0.20.0
diff --git a/ci/minimum/requirements.txt b/ci/minimum/requirements.txt
new file mode 100644
index 0000000..de6fc09
--- /dev/null
+++ b/ci/minimum/requirements.txt
@@ -0,0 +1,11 @@
+# The exact requirements of the oldest supported versions of the dependencies.
+# This file is used in a GitHub Actions workflow to test the compatibility.
+# This file needs to be manually updated to be consistent with
+# `pyproject.toml`.
+nextline-graphql==0.7.8
+httpx==0.26.0
+pytest-asyncio==0.23.0
+pytest-cov==4.1.0
+pytest-timeout==2.2.0
+pytest==7.4.0
+respx==0.20.0