diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 5d8ab4e..fe601ef 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -4,11 +4,16 @@
 # against bad commits.
 
 name: build
-on: [ pull_request, push ]
+on: [ pull_request, push, workflow_dispatch ]
 
 jobs:
   build:
-    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-latest
+          - os: windows-latest
+    runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4