diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ee712b2..12b886f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -140,15 +140,17 @@ jobs:
       matrix:
         include: ${{ fromJSON(
           github.event_name == 'pull_request' &&
-          '[{"arch":"arm64","runner":"macos-latest","python_arch":"arm64","primary":true}]' ||
+          '[{"arch":"arm64","runner":"macos-latest","python_arch":"arm64","deployment_target":"11.0","wheel_platform":"macosx_11_0_arm64","primary":true}]' ||
           inputs.macos_arm64 && inputs.macos_x86_64 &&
-          '[{"arch":"arm64","runner":"macos-latest","python_arch":"arm64","primary":true},{"arch":"x86_64","runner":"macos-15-intel","python_arch":"x64","primary":false}]' ||
+          '[{"arch":"arm64","runner":"macos-latest","python_arch":"arm64","deployment_target":"11.0","wheel_platform":"macosx_11_0_arm64","primary":true},{"arch":"x86_64","runner":"macos-15-intel","python_arch":"x64","deployment_target":"10.15","wheel_platform":"macosx_10_15_x86_64","primary":false}]' ||
           inputs.macos_arm64 &&
-          '[{"arch":"arm64","runner":"macos-latest","python_arch":"arm64","primary":true}]' ||
-          '[{"arch":"x86_64","runner":"macos-15-intel","python_arch":"x64","primary":true}]'
+          '[{"arch":"arm64","runner":"macos-latest","python_arch":"arm64","deployment_target":"11.0","wheel_platform":"macosx_11_0_arm64","primary":true}]' ||
+          '[{"arch":"x86_64","runner":"macos-15-intel","python_arch":"x64","deployment_target":"10.15","wheel_platform":"macosx_10_15_x86_64","primary":true}]'
           ) }}
     name: macos-${{ matrix.arch }}
     runs-on: ${{ matrix.runner }}
+    env:
+      MACOSX_DEPLOYMENT_TARGET: ${{ matrix.deployment_target }}
 
     steps:
       - name: Check out repository
@@ -172,6 +174,9 @@ jobs:
           python -m pip install build
           python -m build --wheel .
 
+      - name: Verify wheel deployment target
+        run: test -f dist/spicedmodel-*-${{ matrix.wheel_platform }}.whl
+
       - name: Build source distribution
         if: inputs.upload_artifacts && matrix.primary && !inputs.linux_x86_64 && !inputs.linux_aarch64
         run: python -m build --sdist .
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..5fa73c9
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,148 @@
+name: Release Package
+
+on:
+  workflow_dispatch:
+    inputs:
+      test:
+        description: Publish to TestPyPI instead of PyPI
+        required: false
+        default: false
+        type: boolean
+
+permissions:
+  contents: write
+
+jobs:
+  get_version:
+    runs-on: ubuntu-latest
+    outputs:
+      version: ${{ steps.get_version.outputs.version }}
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+
+      - name: Get version from pyproject.toml
+        id: get_version
+        run: |
+          version=$(python3 - <<'PY'
+          import tomllib
+          from pathlib import Path
+
+          metadata = tomllib.loads(Path("pyproject.toml").read_text(encoding="utf-8"))
+          print(f"v{metadata['project']['version']}")
+          PY
+          )
+          echo "Found version: ${version}"
+          echo "version=${version}" >> "$GITHUB_OUTPUT"
+
+  tag:
+    runs-on: ubuntu-latest
+    needs: get_version
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          fetch-depth: 0
+
+      - name: Configure Git
+        run: |
+          git config user.name "github-actions"
+          git config user.email "github-actions@github.com"
+
+      - name: Check that tag is available
+        run: |
+          tag="${{ needs.get_version.outputs.version }}"
+          if git rev-parse "$tag" >/dev/null 2>&1; then
+            echo "Tag $tag already exists"
+            exit 1
+          fi
+
+      - name: Create and push tag
+        run: |
+          tag="${{ needs.get_version.outputs.version }}"
+          git tag "$tag"
+          git push origin "$tag"
+
+  build_artifacts:
+    needs:
+      - get_version
+      - tag
+    uses: ./.github/workflows/ci.yml
+    with:
+      linux_x86_64: true
+      linux_aarch64: true
+      macos_arm64: true
+      macos_x86_64: true
+      windows_x86_64: true
+      windows_arm64: true
+      upload_artifacts: true
+    secrets: inherit
+
+  release:
+    runs-on: ubuntu-latest
+    needs:
+      - get_version
+      - build_artifacts
+    permissions:
+      contents: write
+    steps:
+      - name: Download release artifacts
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+        with:
+          path: release-artifacts
+          merge-multiple: true
+
+      - name: List release artifacts
+        run: find release-artifacts -type f | sort
+
+      - name: Create GitHub release and upload assets
+        uses: softprops/action-gh-release@b4309332981a82ec1c5618f44dd2e27cc8bfbfda # v3.0.0
+        with:
+          tag_name: ${{ needs.get_version.outputs.version }}
+          name: Release ${{ needs.get_version.outputs.version }}
+          draft: false
+          prerelease: false
+          files: release-artifacts/*
+
+  publish_testpypi:
+    runs-on: ubuntu-latest
+    if: inputs.test
+    needs: build_artifacts
+    steps:
+      - name: Download distribution artifacts
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+        with:
+          path: dist
+          merge-multiple: true
+
+      - name: List distributions
+        run: find dist -type f | sort
+
+      - name: Publish package distributions to TestPyPI
+        uses: pypa/gh-action-pypi-publish@dc37677b2e1c63e2034f94d8a5b11f265b73ba33 # v1.14.2
+        with:
+          user: __token__
+          password: ${{ secrets.TEST_PYPI_API_TOKEN }}
+          repository-url: https://test.pypi.org/legacy/
+
+  publish_pypi:
+    runs-on: ubuntu-latest
+    if: ${{ !inputs.test }}
+    needs:
+      - build_artifacts
+      - release
+    steps:
+      - name: Download distribution artifacts
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+        with:
+          path: dist
+          merge-multiple: true
+
+      - name: List distributions
+        run: find dist -type f | sort
+
+      - name: Publish package distributions to PyPI
+        uses: pypa/gh-action-pypi-publish@dc37677b2e1c63e2034f94d8a5b11f265b73ba33 # v1.14.2
+        with:
+          user: __token__
+          password: ${{ secrets.PYPI_API_TOKEN }}
diff --git a/pyproject.toml b/pyproject.toml
index 4c6e840..c860e26 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "scikit_build_core.build"
 
 [project]
 name = "spicedmodel"
-version = "1.0.0"
+version = "1.1.0"
 description = "Python wrapper for the Scalable Plasma Ion Composition and Electron Density (SPICED) model"
 readme = "README.md"
 license = "MIT"
diff --git a/spicedmodel/__init__.py b/spicedmodel/__init__.py
index 01f62d2..0091c55 100644
--- a/spicedmodel/__init__.py
+++ b/spicedmodel/__init__.py
@@ -1,4 +1,4 @@
-__version__ = '1.0.0'
+__version__ = '1.1.0'
 
 from . import _CFunctions
 from .Mav import Mav
diff --git a/tests/test_golden.py b/tests/test_golden.py
index 7db77da..6c7c19d 100644
--- a/tests/test_golden.py
+++ b/tests/test_golden.py
@@ -13,7 +13,7 @@
 # reverse-transformed DC output. That cancellation varies slightly between
 # compilers even when the complete model output is stable.
 FOURIER_RTOL = 2e-4
-FOURIER_ATOL = 2e-3
+FOURIER_ATOL = 4e-3
 
 
 def _array(section):