diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 33c4327..1c24639 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,10 @@ on:  # yamllint disable-line rule:truthy
 
 jobs:
   ci:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
       - uses: actions/checkout@v3
       - name: Get tags
@@ -44,7 +47,7 @@ jobs:
 
       - uses: actions/setup-node@v3
         with:
-          node-version: '14'
+          node-version: '16'
           cache: npm
       - run: npm install
       - run: poetry run make -j $(nproc)
diff --git a/Makefile b/Makefile
index 2ba06cf..1876363 100644
--- a/Makefile
+++ b/Makefile
@@ -8,9 +8,9 @@ TARGET_DIRS:=./whispering
 flake8:
 	find $(TARGET_DIRS) | grep '\.py$$' | xargs flake8
 black:
-	find $(TARGET_DIRS) | grep '\.py$$' | xargs black --diff | diff /dev/null -
+	find $(TARGET_DIRS) | grep '\.py$$' | xargs black --diff | python ./scripts/check_null.py
 isort:
-	find $(TARGET_DIRS) | grep '\.py$$' | xargs isort --diff | diff /dev/null -
+	find $(TARGET_DIRS) | grep '\.py$$' | xargs isort --diff | python ./scripts/check_null.py
 pydocstyle:
 	find $(TARGET_DIRS) | grep -v tests | xargs pydocstyle --ignore=D100,D101,D102,D103,D104,D105,D107,D203,D212
 pytest:
@@ -21,7 +21,7 @@ yamllint:
 		| xargs yamllint --no-warnings
 
 version_check:
-	 git tag | python ./scripts/check_version.py --toml pyproject.toml -i README.md --tags /dev/stdin
+	 git tag | python ./scripts/check_version.py --toml pyproject.toml -i README.md --tags -
 
 lint_python: flake8 black isort pydocstyle version_check pytest
 
diff --git a/scripts/check_null.py b/scripts/check_null.py
new file mode 100644
index 0000000..b797863
--- /dev/null
+++ b/scripts/check_null.py
@@ -0,0 +1,13 @@
+#!/usr/bin/env python3
+
+import sys
+
+
+def main() -> None:
+    data = sys.stdin.read()
+    if len(data) != 0:
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/scripts/check_version.py b/scripts/check_version.py
index c494b42..5ffc97b 100644
--- a/scripts/check_version.py
+++ b/scripts/check_version.py
@@ -33,7 +33,7 @@ def get_opts() -> argparse.Namespace:
     oparser = argparse.ArgumentParser()
     oparser.add_argument("--input", "-i", type=Path)
     oparser.add_argument("--toml", "-t", type=Path, required=True)
-    oparser.add_argument("--tags", type=Path)
+    oparser.add_argument("--tags")
     return oparser.parse_args()
 
 
@@ -47,9 +47,13 @@ def main() -> None:
 
     if opts.tags:
         tags = []
-        with opts.tags.open() as f:
-            for line in f:
+        if opts.tags == "-":
+            for line in sys.stdin:
                 tags.append(line[:-1])
+        else:
+            with opts.tags.open() as f:
+                for line in f:
+                    tags.append(line[:-1])
 
         if stable_version not in tags:
             sys.stderr.write(f"Tag {stable_version} not in git tags: {tags}\n")