diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index eaec722..4dbc817 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -13,9 +13,21 @@ env:
 jobs:
   build:
     name: Build
-    runs-on: "ubuntu-latest"
+    strategy:
+      matrix:
+        runner:
+          - ubuntu-latest
+          - windows-latest
+          - macos-latest
+    runs-on: ${{ matrix.runner }}
     steps:
-      - uses: "actions/checkout@v2"
+      - uses: "actions/checkout@v4"
+      - name: Install Windows dependencies.
+        run: choco install pandoc
+        if: matrix.runner == 'windows-latest'
+      - name: Install macOS dependencies.
+        run: brew install pandoc
+        if: matrix.runner == 'macos-latest'
       - uses: "r-lib/actions/setup-r@v2"
       - uses: r-lib/actions/setup-r-dependencies@v2
         with: