diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 653a008..e69f6e9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,11 +12,12 @@ concurrency:
 
 jobs:
   test:
-    name: Test (Python ${{ matrix.python-version }})
-    runs-on: ubuntu-latest
+    name: Test (${{ matrix.os }}, Python ${{ matrix.python-version }})
+    runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
+        os: [ubuntu-latest, windows-latest]
         python-version: ["3.10", "3.11", "3.12"]
 
     steps:
@@ -47,7 +48,7 @@ jobs:
           cache: "pip"
 
       - name: Install Ruff
-        run: pip install ruff
+        run: pip install ruff==0.12.3
 
       - name: Ruff check
         run: ruff check .
diff --git a/pyproject.toml b/pyproject.toml
index 496a42a..bb37a87 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,7 +38,7 @@ dependencies = [
 [project.optional-dependencies]
 dev = [
     "pytest>=8.0.0",
-    "ruff>=0.8.0",
+    "ruff==0.12.3",
 ]
 
 [project.scripts]