diff --git a/.cirrus.yml b/.cirrus.yml
index c54ff6e7656..8095910b231 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -41,7 +41,6 @@ tests_task:
     - echo "PATH=${POETRY_HOME}/bin:${PATH}" >> $CIRRUS_ENV
 
   setup_environment_script:
-    # FIXME: --sync is broken due to a bug with py-sqlite3 packaging.
     # TODO: caching
     - poetry install
     - poetry env info
diff --git a/.github/actions/bootstrap-poetry/action.yml b/.github/actions/bootstrap-poetry/action.yml
index ad8ec7d6b2a..5a8a8013dd5 100644
--- a/.github/actions/bootstrap-poetry/action.yml
+++ b/.github/actions/bootstrap-poetry/action.yml
@@ -3,29 +3,42 @@ description: Configure the environment with the specified Python and Poetry vers
 
 inputs:
   python-version:
-    description: Desired Python version
-    default: "3.12"
+    description: Desired Python version expression
+    default: '3.12'
   python-latest:
     description: Use an uncached Python if a newer match is available
     default: 'false'
+  python-prereleases:
+    description: Allow usage of pre-release Python versions
+    default: 'false'
   poetry-spec:
     description: pip-compatible installation specification to use for Poetry
     default: 'poetry'
 
+outputs:
+  python-path:
+    description: Path to the installed Python interpreter
+    value: ${{ steps.setup-python.outputs.python-path }}
+  python-version:
+    description: Version of the installed Python interpreter
+    value: ${{ steps.setup-python.outputs.python-version }}
+
 runs:
   using: composite
   steps:
+    - uses: actions/setup-python@v5
+      id: setup-python
+      with:
+        python-version: ${{ inputs.python-version }}
+        check-latest: ${{ inputs.python-latest == 'true' }}
+        allow-prereleases: ${{ inputs.python-prereleases == 'true' }}
+        update-environment: false
+
+    - run: pipx install --python '${{ steps.setup-python.outputs.python-path }}' '${{ inputs.poetry-spec }}'
+      shell: bash
+
     # Enable handling long path names (+260 char) on the Windows platform
     # https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file#maximum-path-length-limitation
     - run: git config --system core.longpaths true
       if: runner.os == 'Windows'
       shell: pwsh
-
-    - run: pipx install '${{ inputs.poetry-spec }}'
-      shell: bash
-
-    - uses: actions/setup-python@v5
-      with:
-        python-version: ${{ inputs.python-version }}
-        check-latest: ${{ inputs.python-latest == 'true' }}
-        cache: poetry
diff --git a/.github/actions/poetry-install/action.yml b/.github/actions/poetry-install/action.yml
new file mode 100644
index 00000000000..bc0c03f7123
--- /dev/null
+++ b/.github/actions/poetry-install/action.yml
@@ -0,0 +1,50 @@
+name: Poetry Install
+description: Run `poetry install` with optional artifact and metadata caching
+
+inputs:
+  args:
+    description: Arguments for `poetry install`
+  cache:
+    description: Enable transparent Poetry artifact and metadata caching
+    default: 'true'
+
+outputs:
+  cache-hit:
+    description: Whether an exact cache hit occured
+    value: ${{ steps.cache.outputs.cache-hit }}
+
+runs:
+  using: composite
+  steps:
+    - run: printf 'cache-dir=%s\n' "$(poetry config cache-dir)" >> $GITHUB_OUTPUT
+      id: poetry-config
+      shell: bash
+
+    # Bust the cache every 24 hours to prevent it from expanding over time.
+    - run: printf 'date=%s\n' "$(date -I)" >> $GITHUB_OUTPUT
+      id: get-date
+      if: inputs.cache == 'true'
+      shell: bash
+
+    - uses: actions/cache@v4
+      id: cache
+      if: inputs.cache == 'true'
+      with:
+        path: |
+          ${{ steps.poetry-config.outputs.cache-dir }}/artifacts
+          ${{ steps.poetry-config.outputs.cache-dir }}/cache
+        key: poetry-${{ steps.get-date.outputs.date }}-${{ runner.os }}-${{ hashFiles('pyproject.toml', 'poetry.lock') }}
+        # The cache is cross-platform, and other platforms are used to seed cache misses.
+        restore-keys: |
+          poetry-${{ steps.get-date.outputs.date }}-${{ runner.os }}-
+          poetry-${{ steps.get-date.outputs.date }}-
+        enableCrossOsArchive: true
+
+    - run: poetry install ${{ inputs.args }}
+      shell: bash
+
+    - run: poetry env info
+      shell: bash
+
+    - run: poetry show
+      shell: bash
diff --git a/.github/workflows/.tests-matrix.yaml b/.github/workflows/.tests-matrix.yaml
index 661097db8ba..f2d931d47b5 100644
--- a/.github/workflows/.tests-matrix.yaml
+++ b/.github/workflows/.tests-matrix.yaml
@@ -31,21 +31,18 @@ jobs:
       - uses: actions/checkout@v4
 
       - uses: ./.github/actions/bootstrap-poetry
+        id: bootstrap-poetry
         with:
           python-version: ${{ inputs.python-version }}
 
-      - run: poetry install --sync
-
-      - run: poetry env info
-
-      - run: poetry show
+      - uses: ./.github/actions/poetry-install
 
       - uses: actions/cache@v4
         with:
           path: .mypy_cache
-          key: mypy-${{ runner.os }}-${{ env.pythonLocation }}-${{ hashFiles('pyproject.toml', 'poetry.lock') }}
+          key: mypy-${{ runner.os }}-py${{ steps.bootstrap-poetry.outputs.python-version }}-${{ hashFiles('pyproject.toml', 'poetry.lock') }}
           restore-keys: |
-            mypy-${{ runner.os }}-${{ env.pythonLocation }}-
+            mypy-${{ runner.os }}-py${{ steps.bootstrap-poetry.outputs.python-version }}-
             mypy-${{ runner.os }}-
 
       - run: poetry run mypy
@@ -61,11 +58,9 @@ jobs:
         with:
           python-version: ${{ inputs.python-version }}
 
-      - run: poetry install --sync --with github-actions
-
-      - run: poetry env info
-
-      - run: poetry show
+      - uses: ./.github/actions/poetry-install
+        with:
+          args: --with github-actions
 
       - run: poetry run pytest --integration -v
         env:
@@ -85,11 +80,9 @@ jobs:
         with:
           python-version: ${{ inputs.python-version }}
 
-      - run: poetry install --sync --with github-actions
-
-      - run: poetry env info
-
-      - run: poetry show
+      - uses: ./.github/actions/poetry-install
+        with:
+          args: --with github-actions
 
       - run: poetry run pip list --format json | jq -r '.[] | "\(.name)=\(.version)"' >> $GITHUB_OUTPUT
         id: package-versions
diff --git a/.github/workflows/backport.yaml b/.github/workflows/backport.yaml
index aca765d1b91..e7f8faa0186 100644
--- a/.github/workflows/backport.yaml
+++ b/.github/workflows/backport.yaml
@@ -28,13 +28,13 @@ jobs:
         with:
           app-id: ${{ secrets.POETRY_TOKEN_APP_ID }}
           private-key: ${{ secrets.POETRY_TOKEN_APP_KEY }}
-      - run: |
+      - name: backport.sh
+        run: |
           git config --global user.name  "${{ steps.app-token.outputs.slug }}[bot]"
           git config --global user.email "${{ steps.app-token.outputs.slug }}[bot]@users.noreply.github.com"
 
           gh repo fork --remote-name fork
 
           ./.github/scripts/backport.sh --pr ${{ github.event.pull_request.number }} --comment --remote fork
-        name: backport.sh
         env:
             GH_TOKEN: ${{ steps.app-token.outputs.token }}
diff --git a/.github/workflows/docs.yaml b/.github/workflows/docs.yaml
index 86b8fe6cfeb..a11465733c4 100644
--- a/.github/workflows/docs.yaml
+++ b/.github/workflows/docs.yaml
@@ -46,9 +46,12 @@ jobs:
 
       - uses: ./.github/actions/bootstrap-poetry
 
-      - run: poetry install --sync --no-root --only main
+      - uses: ./.github/actions/poetry-install
+        with:
+          args: --no-root --only main
 
-      - run: |
+      - name: website-build
+        run: |
           # Rebuild the docs files from the PR checkout.
           poetry run python bin/website build --local ./poetry
           # Build website assets (CSS/JS).
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 49c8d951b84..891657f2162 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -35,7 +35,9 @@ jobs:
   upload-pypi:
     name: Upload (PyPI)
     runs-on: ubuntu-latest
-    environment: pypi
+    environment:
+      name: pypi
+      url: https://pypi.org/project/poetry/
     permissions:
       id-token: write
     needs: build
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 128290183d9..4b755ba024d 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -20,9 +20,8 @@ jobs:
     outputs:
       project: ${{ steps.changes.outputs.project }}
       fixtures-pypi: ${{ steps.changes.outputs.fixtures-pypi }}
-      mypy: ${{ steps.changes.outputs.mypy }}
-      pytest: ${{ steps.changes.outputs.pytest }}
-      pytest-export: ${{ steps.changes.outputs.pytest-export }}
+      src: ${{ steps.changes.outputs.src }}
+      tests: ${{ steps.changes.outputs.tests }}
     steps:
       - uses: actions/checkout@v4
       - uses: dorny/paths-filter@v3
@@ -39,16 +38,13 @@ jobs:
             fixtures-pypi:
               - *workflow
               - 'tests/repositories/fixtures/pypi.org/**'
-            mypy:
+            src:
               - *project
               - 'src/**.py'
-            pytest:
+            tests:
               - *project
               - 'src/**.py'
               - 'tests/**'
-            pytest-export:
-              - *project
-              - 'src/**.py'
 
   lockfile:
     name: Check poetry.lock
@@ -62,6 +58,25 @@ jobs:
 
       - run: poetry check --lock
 
+  smoke:
+    name: Smoke-test build and install
+    runs-on: ubuntu-latest
+    if: needs.changes.outputs.project == 'true'
+    needs: lockfile
+    steps:
+      - uses: actions/checkout@v4
+
+      - run: pipx run build
+
+      - run: pipx run twine check --strict dist/*
+
+      - run: pipx install --suffix=@build dist/*.whl
+
+      - uses: ./.github/actions/bootstrap-poetry
+
+      # Smoke test: confirm the version of the installed wheel matches the project.
+      - run: poetry@build --version | grep $(poetry version --short)
+
   fixtures-pypi:
     name: Check fixtures (PyPI)
     runs-on: ubuntu-latest
@@ -72,7 +87,9 @@ jobs:
 
       - uses: ./.github/actions/bootstrap-poetry
 
-      - run: poetry install --sync --only main,test
+      - uses: ./.github/actions/poetry-install
+        with:
+          args: --only main,test
 
       - run: poetry run env PYTHONPATH="$GITHUB_WORKSPACE" python tests/repositories/fixtures/pypi.org/generate.py
 
@@ -99,9 +116,9 @@ jobs:
     with:
       runner: ${{ matrix.os.image }}
       python-version: ${{ matrix.python-version }}
-      run-mypy: ${{ needs.changes.outputs.mypy == 'true' }}
-      run-pytest: ${{ needs.changes.outputs.pytest == 'true' }}
-      run-pytest-export: ${{ needs.changes.outputs.pytest-export == 'true' }}
+      run-mypy: ${{ needs.changes.outputs.src == 'true' }}
+      run-pytest: ${{ needs.changes.outputs.tests == 'true' }}
+      run-pytest-export: ${{ needs.changes.outputs.src == 'true' }}
     secrets: inherit
 
   status:
@@ -110,6 +127,7 @@ jobs:
     if: always()
     needs:
       - lockfile
+      - smoke
       - fixtures-pypi
       - tests-matrix
     steps: