diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 47da777..317f281 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,12 +9,15 @@ on:
 
 jobs:
   tests:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     env:
       CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
     strategy:
       fail-fast: false
       matrix:
+        os:
+          - ubuntu-latest
+          - windows-latest
         python-version:
           - "3.8"
           - "3.9"
@@ -24,6 +27,9 @@ jobs:
           - "3.13"
           - "3.14"
           - "pypy-3.9"
+        exclude:
+          - os: windows-latest
+            python-version: "pypy-3.9"
     steps:
       - name: Check out repository
         uses: actions/checkout@v4
@@ -34,6 +40,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - name: Install system dependencies
+        if: runner.os == 'Linux'
         run: |
           sudo apt-get update
           sudo apt-get install -y zip p7zip-full
@@ -41,7 +48,7 @@ jobs:
       - name: Install Python dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install . pytest pytest-cov
+          python -m pip install . pytest pytest-cov
 
       - name: Run tests
         run: pytest -vv --cov=jsonstore --cov-report=xml --junitxml=test-results.xml