diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 49397323..2636495c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -7,7 +7,13 @@ jobs:
   build:
     name: Build
     runs-on:
-      - ubuntu-latest
+      - ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+        python-version: ["3.9", "3.14"] # oldest supported and latest tested
+    env:
+      codegen-python-version: "3.9"
     steps:
       - name: Check out repo
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
@@ -17,30 +23,20 @@ jobs:
         uses: ni/python-actions/setup-python@9768589f3e50672173dad75a6fc181e4a85d33fa # v0.7.0
         id: setup-python
         with:
-          # The codegen scripts require Python 3.10 or later.
-          python-version: "3.10"
+          python-version: ${{ matrix.python-version }}
       - name: Set up Poetry
         uses: ni/python-actions/setup-poetry@9768589f3e50672173dad75a6fc181e4a85d33fa # v0.7.0
-      - name: Cache virtualenv (all extras)
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
+      - name: Run linters and type checkers
+        uses: ni/python-actions/analyze-project@9768589f3e50672173dad75a6fc181e4a85d33fa # v0.7.0
         with:
-          path: .venv
-          key: nidaqmx-all-extras-and-examples-${{ runner.os }}-py${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('poetry.lock') }}
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          poetry install --all-extras --with examples
-      - name: Run linters
-        run: poetry run ni-python-styleguide lint
-      - name: Run mypy (Linux)
-        run: poetry run mypy
-      - name: Run mypy (Windows)
-        run: poetry run mypy --platform win32
+          install-args: "--all-extras --with examples"
       - name: Run Bandit security checks
         run: poetry run bandit -c pyproject.toml -r generated/nidaqmx
       - name: Generate ni-daqmx files
+        if: ${{ runner.os == 'Linux' && matrix.python-version == env.codegen-python-version }}
         run: |
           rm -fr generated/nidaqmx
           poetry run python src/codegen --dest generated/nidaqmx
       - name: Check for files dirtied by codegen
+        if: ${{ runner.os == 'Linux' && matrix.python-version == env.codegen-python-version }}
         run: git diff --exit-code
diff --git a/generated/nidaqmx/_feature_toggles.py b/generated/nidaqmx/_feature_toggles.py
index 908ab1e2..beda1173 100644
--- a/generated/nidaqmx/_feature_toggles.py
+++ b/generated/nidaqmx/_feature_toggles.py
@@ -1,5 +1,6 @@
 """nidaqmx feature toggles."""
 
+# mypy: no-warn-unreachable
 from __future__ import annotations
 
 import functools
@@ -20,8 +21,6 @@
 
 _PREFIX = "NIDAQMX"
 
-_config = AutoConfig(str(get_dotenv_search_path()))
-
 if TYPE_CHECKING:
     # Work around decouple's lack of type hints.
     def _config(
@@ -30,6 +29,9 @@ def _config(
         cast: Callable[[str], _T] | Undefined = undefined,
     ) -> _T: ...
 
+else:
+    _config = AutoConfig(str(get_dotenv_search_path()))
+
 
 # Based on the recipe at https://docs.python.org/3/howto/enum.html
 class _OrderedEnum(Enum):
diff --git a/src/handwritten/_feature_toggles.py b/src/handwritten/_feature_toggles.py
index 908ab1e2..beda1173 100644
--- a/src/handwritten/_feature_toggles.py
+++ b/src/handwritten/_feature_toggles.py
@@ -1,5 +1,6 @@
 """nidaqmx feature toggles."""
 
+# mypy: no-warn-unreachable
 from __future__ import annotations
 
 import functools
@@ -20,8 +21,6 @@
 
 _PREFIX = "NIDAQMX"
 
-_config = AutoConfig(str(get_dotenv_search_path()))
-
 if TYPE_CHECKING:
     # Work around decouple's lack of type hints.
     def _config(
@@ -30,6 +29,9 @@ def _config(
         cast: Callable[[str], _T] | Undefined = undefined,
     ) -> _T: ...
 
+else:
+    _config = AutoConfig(str(get_dotenv_search_path()))
+
 
 # Based on the recipe at https://docs.python.org/3/howto/enum.html
 class _OrderedEnum(Enum):