diff --git a/.github/workflows/build-cross.yml b/.github/workflows/build-cross.yml
new file mode 100644
index 0000000..a0bc14b
--- /dev/null
+++ b/.github/workflows/build-cross.yml
@@ -0,0 +1,133 @@
+name: Build binaries for platforms under QEMU
+
+on:
+  push:
+    tags:
+      - "v*"
+    branches:
+      - main
+  workflow_dispatch:
+  pull_request:
+
+permissions:
+  contents: write
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build-cross:
+    name: ${{ matrix.name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - { name: "Linux-aarch64", target: aarch64-linux, os: ubuntu-20.04 }
+    steps:
+      - name: Checkout source code
+        uses: actions/checkout@v4
+
+      - name: Check for release
+        id: is-release
+        shell: bash
+        run: |
+          unset IS_RELEASE ; if [[ $GITHUB_REF =~ ^refs/tags/v[0-9].* ]]; then IS_RELEASE='true' ; fi
+          echo "IS_RELEASE=${IS_RELEASE}" >> $GITHUB_OUTPUT
+
+      - uses: uraimo/run-on-arch-action@v2
+        name: Build binary under QEMU
+        id: build
+        with:
+          arch: aarch64
+          distro: ubuntu22.04
+          # Not required, but speeds up builds by storing container images in
+          # a GitHub package registry.
+          githubToken: ${{ github.token }}
+          run: |
+            apt update
+            apt install python3-pip -y
+            pip install .
+
+            # aliens: requires no source
+            ALIENS_NAME="aliens-${{ matrix.target }}.bin"
+            ALIENS_PATH=${PWD}/${ALIENS_NAME}
+            # packaged $ALIENS_NAME 'pip install pygame' 'python -m pygame.examples.aliens'
+
+            # textual: requires no source
+            TEXTUAL_NAME="textual-${{ matrix.target }}.bin"
+            TEXTUAL_PATH=${PWD}/${TEXTUAL_NAME}
+            packaged $TEXTUAL_NAME 'pip install pygame' 'python -m textual'
+
+            # IPython: requires no source
+            IPYTHON_NAME="ipython-${{ matrix.target }}.bin"
+            IPYTHON_PATH=${PWD}/${IPYTHON_NAME}
+            packaged $IPYTHON_NAME 'pip install ipython' 'ipython'
+
+            # ./examples/mandelbrot
+            MANDELBROT_NAME="mandelbrot-${{ matrix.target }}.bin"
+            MANDELBROT_PATH=${PWD}/${MANDELBROT_NAME}
+            packaged $MANDELBROT_NAME 'pip install -r requirements.txt' 'python mandelbrot.py' ./example/mandelbrot
+
+            # ./examples/minesweeper
+            MINESWEEPER_NAME="minesweeper-${{ matrix.target }}.bin"
+            MINESWEEPER_PATH=${PWD}/${MINESWEEPER_NAME}
+            packaged ./example/minesweeper
+            mv ./minesweeper.bin $MINESWEEPER_NAME
+
+            # Setup output paths for upload
+            echo ::set-output name=ALIENS_NAME::"${ALIENS_NAME}"
+            echo ::set-output name=ALIENS_PATH::"${ALIENS_PATH}"
+            echo ::set-output name=TEXTUAL_NAME::"${TEXTUAL_NAME}"
+            echo ::set-output name=TEXTUAL_PATH::"${TEXTUAL_PATH}"
+            echo ::set-output name=IPYTHON_NAME::"${IPYTHON_NAME}"
+            echo ::set-output name=IPYTHON_PATH::"${IPYTHON_PATH}"
+            echo ::set-output name=MANDELBROT_NAME::"${MANDELBROT_NAME}"
+            echo ::set-output name=MANDELBROT_PATH::"${MANDELBROT_PATH}"
+            echo ::set-output name=MINESWEEPER_NAME::"${MINESWEEPER_NAME}"
+            echo ::set-output name=MINESWEEPER_PATH::"${MINESWEEPER_PATH}"
+
+      - name: Upload aliens
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ steps.build.outputs.ALIENS_NAME }}
+          path: ${{ steps.build.outputs.ALIENS_PATH }}
+
+      - name: Upload textual
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ steps.build.outputs.TEXTUAL_NAME }}
+          path: ${{ steps.build.outputs.TEXTUAL_PATH }}
+
+      - name: Upload IPython
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ steps.build.outputs.IPYTHON_NAME }}
+          path: ${{ steps.build.outputs.IPYTHON_PATH }}
+
+      - name: Upload mandelbrot
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ steps.build.outputs.MANDELBROT_NAME }}
+          path: ${{ steps.build.outputs.MANDELBROT_PATH }}
+
+      - name: Upload minesweeper
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ steps.build.outputs.MINESWEEPER_NAME }}
+          path: ${{ steps.build.outputs.MINESWEEPER_PATH }}
+
+      - name: Publish packages
+        uses: softprops/action-gh-release@v1
+        if: steps.is-release.outputs.IS_RELEASE
+        with:
+          draft: true
+          files: |
+            ${{ steps.build.outputs.ALIENS_PATH }}
+            ${{ steps.build.outputs.TEXTUAL_PATH }}
+            ${{ steps.build.outputs.IPYTHON_PATH }}
+            ${{ steps.build.outputs.MANDELBROT_PATH }}
+            ${{ steps.build.outputs.MINESWEEPER_PATH }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 950a8a4..9909503 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -25,9 +25,6 @@ jobs:
       matrix:
         include:
           - { name: "Linux-x86_64", target: x86_64-linux, os: ubuntu-20.04 }
-          # No arm linux OS available on github actions.
-          # Find another way.
-          # - { name: "Linux-aarch64", target: aarch64-linux, os: ubuntu-latest }
           - { name: "macOS-x86_64", target: x86_64-darwin, os: macOS-13 }
           - { name: "macOS-aarch64", target: aarch64-darwin, os: macOS-14 }
           # - {
diff --git a/.github/workflows/tox.yml b/.github/workflows/tox.yml
index a0f187e..531423f 100644
--- a/.github/workflows/tox.yml
+++ b/.github/workflows/tox.yml
@@ -11,7 +11,12 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        include:
+          - { python-version: "3.8", tox-env: "py38" }
+          - { python-version: "3.9", tox-env: "py39" }
+          - { python-version: "3.10", tox-env: "py310" }
+          - { python-version: "3.11", tox-env: "py311" }
+          - { python-version: "3.12", tox-env: "py312" }
     name: Python ${{ matrix.python-version }} tests
     steps:
       - uses: actions/checkout@v2
@@ -23,4 +28,4 @@ jobs:
       - name: Install dependencies
         run: pip install -r requirements-dev.txt
       - name: Run tests and type checking
-        run: tox
+        run: tox -e ${{matrix.tox-env }}