diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1bb0af1..a10425d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -4,45 +4,66 @@ on:
   push:
     branches:
       - master
-      - 'development-*'   # add pattern for development branches
+      - 'development-*'
   pull_request:
     branches:
       - master
-      - 'development-*'   # allow PRs targeting development-* branches
+      - 'development-*'
 
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+defaults:
+  run:
+    shell: bash   # Use bash on all runners (incl. Windows)
 
 jobs:
-    test:
-        runs-on: ubuntu-latest
-        steps:
-            - name: Check out source
-              uses: actions/checkout@v4
-
-            - name: Set up Python
-              uses: actions/setup-python@v5
-              with:
-                  python-version: "3.10"
-
-            - name: Install project + dev deps
-              run: |
-                  python -m pip install --upgrade pip
-                  pip install -e ".[dev]"
-
-            - name: Check formatting with Black
-              run: black --check .
-
-            - name: Lint with Ruff
-              run: ruff check .
-
-            - name: Run tests script
-              run: ./tests/run-tests.sh
-
-            - name: Check .tests/*.txt not modified
-              run: |
-                  # Fail if there are changes in .tests/*.txt
-                  if ! git diff --exit-code -- .tests/*.txt; then
-                      echo "::error::.tests/*.txt changed after running tests."
-                      exit 1
-                  fi
-            - name: Run unit tests with coverage
-              run: pytest --cov=arib --cov-report=term-missing
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest]   # add macOS later if needed (costs 10× minutes)
+        python-version: ["3.10"]              # expand to ["3.10","3.11","3.12"] if you want
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Check out source
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix['python-version'] }}
+          cache: 'pip'
+          cache-dependency-path: |
+            requirements*.txt
+            pyproject.toml
+            setup.cfg
+            setup.py
+
+      - name: Install project + dev deps
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e ".[dev]"
+
+      - name: Check formatting with Black
+        run: black --check .
+
+      - name: Lint with Ruff
+        run: ruff check .
+
+      # If your ./tests/run-tests.sh is bash-friendly, this works cross-OS:
+      - name: Run tests script
+        run: bash ./tests/run-tests.sh
+
+      - name: Check .tests/*.txt not modified
+        run: |
+          # Fail if there are changes in .tests/*.txt
+          if ! git diff --exit-code -- .tests/*.txt; then
+            echo "::error::.tests/*.txt changed after running tests."
+            exit 1
+          fi
+
+      - name: Run unit tests with coverage
+        run: pytest --cov=arib --cov-report=term-missing