diff --git a/.github/workflows/test-and-release.yml b/.github/workflows/test-and-release.yml
new file mode 100644
index 0000000..9efebdd
--- /dev/null
+++ b/.github/workflows/test-and-release.yml
@@ -0,0 +1,95 @@
+name: 'Test and Release PyDSDL'
+on: push
+
+# Ensures that only one workflow is running at a time
+concurrency:
+  group: ${{ github.workflow_sha }}
+  cancel-in-progress: true
+
+jobs:
+  pydsdl-test:
+    name: Test PyDSDL
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ ubuntu-latest, macos-latest ]
+        python: [ '3.7', '3.8', '3.9', '3.10', '3.11' ]
+        include:
+          - os: windows-2019
+            python: '3.10'
+          - os: macos-latest
+            python: '3.9'
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Check out pydsdl
+        uses: actions/checkout@v3
+
+      - name: Check out public_regulated_data_types
+        uses: actions/checkout@v3
+        with:
+          repository: OpenCyphal/public_regulated_data_types
+          path: .dsdl-test
+
+      - name: Install Python3
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python }}
+
+      - name: Log Python version
+        run: python --version
+
+      - name: Install dependencies
+        run: |
+          if [ "$RUNNER_OS" == "Linux" ]; then
+            sudo apt-get --ignore-missing update || true
+            sudo apt-get install -y linux-*-extra-$(uname -r) graphviz
+          fi
+          python -m pip install --upgrade pip setuptools nox typed_ast
+        shell: bash
+
+      - name: Run build and test
+        run: |
+          if [ "$RUNNER_OS" == "Linux" ]; then
+            nox --non-interactive --error-on-missing-interpreters --session test test_eol pristine lint --python ${{ matrix.python }}
+            nox --non-interactive --session docs
+          elif [ "$RUNNER_OS" == "Windows" ]; then
+            nox --forcecolor --non-interactive --error-on-missing-interpreters --session test test_eol pristine lint
+          elif [ "$RUNNER_OS" == "macOS" ]; then
+            nox --non-interactive --error-on-missing-interpreters --session test test_eol pristine lint --python ${{ matrix.python }}
+          else
+            echo "${{ runner.os }} not supported"
+            exit 1
+          fi
+          python -c "import pydsdl; pydsdl.read_namespace('.dsdl-test/uavcan', [])"
+        shell: bash
+
+  pydsdl-release:
+    name: Release PyDSDL
+    if: contains(github.event.head_commit.message, '#release') || contains(github.ref, '/master')
+    needs: pydsdl-test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out
+        uses: actions/checkout@v3
+
+      - name: Build distribution
+        run: |
+          python -m pip install --upgrade pip setuptools wheel twine
+          python setup.py sdist bdist_wheel
+
+      - name: Get release version
+        run: echo "pydsdl_version=$(python3 -c 'import pydsdl; print(pydsdl.__version__)')" >> $GITHUB_ENV
+
+      - name: Upload distribution
+        run: |
+          python -m twine upload dist/*
+        env:
+          TWINE_USERNAME: __token__
+          TWINE_PASSWORD: ${{ secrets.PYPI_API_TOKEN_PYDSDL }}
+
+      - name: Push version tag
+        uses: mathieudutour/github-tag-action@v6.1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          custom_tag: ${{ env.pydsdl_version }}
+          tag_prefix: ''
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index d265d63..0000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,98 +0,0 @@
-# https://www.appveyor.com/blog/2018/04/25/specialized-build-matrix-configuration-in-appveyor/
-# https://www.appveyor.com/docs/job-workflows/
-# https://www.appveyor.com/docs/how-to/git-push/
-environment:
-  matrix:
-    - job_group: tests
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-      PYTHON: "C:\\Python310-x64"
-
-    - job_group: tests
-      APPVEYOR_BUILD_WORKER_IMAGE: macos
-      PYTHON: "3.9"
-
-    - job_group: tests
-      APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu2004
-      PYTHON: "3.11"
-
-    - job_group: tests
-      APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu2004
-      PYTHON: "3.10"
-
-    - job_group: tests
-      APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu2004
-      PYTHON: "3.9"
-
-    - job_group: tests
-      APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu2004
-      PYTHON: "3.8"
-
-    - job_group: tests
-      APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu2004
-      PYTHON: "3.7"
-
-    - job_group: tests
-      APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu2004
-      PYTHON: "3.6"
-
-    - job_name: deploy
-      job_depends_on: tests
-      APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu2004
-      PYTHON: "3.10"
-
-  GIT_TOKEN:
-    secure: +jQhxLpePj6hdDryfET/XpLo7VL9fhDXVHlwLOPp/nRDYe97TJAfd0XCTuPz1qkT
-  TWINE_USERNAME: __token__
-  TWINE_PASSWORD:
-    secure: +ZVhECKV0ESBrvUGXVd9wpt9xhMMHeIXSJalghKMKGCrxqvvg7/yMm9kPO+xH1T310zzMpnDUxknR1Q05mjAX5MU70MiHiWAB2fBjNwrMSTQZP4kCpKtznAIM/iCwVczbNolbB3tsUn4OS3rQjXyz7lUdYnaeM7sqF1IZNj55/spCPsAJUmi5DYj8M+6zkaPdCZEswlH7lARJG1g+l4/tbyiBssuyDdmY0AQxJVXDGBXKeHU8frHrWayEI5holjF+oFwx2b6Fz1zZ7uznrGpDQ==
-
-stack: python %PYTHON%
-build: off
-skip_tags: true
-
-for:
-  # TEST PIPELINE
-  - matrix:
-      only:
-        - job_group: tests
-    install:
-      # MS Windows config.
-      - cmd: 'SET PATH=%PYTHON%;%PATH%'
-      - cmd: 'SET PATH=%PYTHON%\\Scripts;%PATH%'
-      - cmd: 'echo %PATH%'
-      # Shared config.
-      - python -m pip install --upgrade pip setuptools nox typed_ast
-      - python --version
-    test_script:
-      # GNU/Linux test.
-      - sh: nox --non-interactive --error-on-missing-interpreters --session test test_eol pristine lint --python $PYTHON
-      # skip macOS docs build
-      - sh: 'if [ "$APPVEYOR_BUILD_WORKER_IMAGE" != "macos" ]; then nox --non-interactive --session docs; fi'
-      # MS Windows test.
-      - cmd: nox --forcecolor --non-interactive --error-on-missing-interpreters --session test test_eol pristine lint
-      # Shared test for all platforms.
-      - git clone https://github.com/OpenCyphal/public_regulated_data_types .dsdl-test
-      - python -c "import pydsdl; pydsdl.read_namespace('.dsdl-test/uavcan', [])"
-
-  # DEPLOYMENT PIPELINE
-  - matrix:
-      only:
-        - job_name: deploy
-    branches:
-      only:
-        - master
-    install:
-      - python -m pip install --upgrade pip setuptools wheel twine
-    deploy_script:
-      # Ensure we deploy only from master, not from PR builds.
-      - '[[ "$APPVEYOR_REPO_BRANCH" == "master" ]] && [[ -z "$APPVEYOR_PULL_REQUEST_HEAD_COMMIT" ]] || exit'
-      # Configure git credentials.
-      - echo "https://${GIT_TOKEN}:x-oauth-basic@github.com" > ~/.git-credentials
-      - git config --global credential.helper store
-      - git config --global user.email "devnull@opencyphal.org"
-      - git config --global user.name  "Release Automation"
-      # Tag and publish this release. Push the tag after the release is out in case it could not be published.
-      - 'git tag $(python3 -c "import pydsdl; print(pydsdl.__version__)")'
-      - 'python setup.py sdist bdist_wheel'
-      - 'python -m twine upload dist/*'
-      - 'git push --tags'
diff --git a/noxfile.py b/noxfile.py
index 04ab3d5..6939d8e 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -61,7 +61,7 @@ def test(session):
         session.log(f"OPEN IN WEB BROWSER: file://{report_file}")
 
 
-@nox.session(python=["3.6", "3.7"])
+@nox.session(python=["3.7"])
 def test_eol(session):
     """This is a minimal test session for those old Pythons that have EOLed."""
     session.install("-e", ".")
diff --git a/pydsdl/__init__.py b/pydsdl/__init__.py
index 5662cf1..d07f1f2 100644
--- a/pydsdl/__init__.py
+++ b/pydsdl/__init__.py
@@ -7,7 +7,7 @@
 import sys as _sys
 from pathlib import Path as _Path
 
-__version__ = "1.20.0"
+__version__ = "1.20.1"
 __version_info__ = tuple(map(int, __version__.split(".")[:3]))
 __license__ = "MIT"
 __author__ = "OpenCyphal"
diff --git a/pydsdl/_namespace.py b/pydsdl/_namespace.py
index 82bb84e..8e9501e 100644
--- a/pydsdl/_namespace.py
+++ b/pydsdl/_namespace.py
@@ -629,7 +629,7 @@ def _unittest_common_usage_errors() -> None:
         _ensure_no_common_usage_errors(dir_dsdl, [di / "baz"], reports.append)
         (rep,) = reports
         reports.clear()
-        assert str(dir_dsdl_uavcan).lower() in rep.lower()
+        assert str(dir_dsdl_uavcan.resolve()).lower() in rep.lower()
 
 
 def _unittest_nested_roots() -> None: