diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 57637c7..faed981 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -13,6 +13,9 @@ jobs:
         run: echo "$GITHUB_CONTEXT"
 
   build-test:
+    strategy:
+      matrix:
+        os: [ ubuntu-latest, macos-latest, windows-latest ]
     runs-on: ${{ matrix.os }}
     if: startsWith(github.ref, 'refs/tags/')
     steps:
@@ -21,7 +24,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: [ '3.x' ]
+          python-version: '3.x'
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 37a3ac3..8d50391 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -23,11 +23,11 @@ jobs:
         run: echo "$GITHUB_CONTEXT"
 
   tests:
-    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: [ ubuntu-latest, macos-latest, windows-latest ]
         python-version: [ '3.9', '3.10', '3.11', '3.12', '3.13' ]
+    runs-on: ${{ matrix.os }}
     steps:
       - name: Check out the repository
         uses: actions/checkout@v4