diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c15606df..058082e5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,15 +1,18 @@
 name: CI
-on:
-  push:
-    branches: [ main ]
-  pull_request:
+on: [push, pull_request]
 jobs:
   test:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['2.6', '2.7', '3.0', '3.1', '3.2']
-    runs-on: ubuntu-latest
+        ruby: ['2.6', '2.7', '3.0', '3.1', '3.2', 'head']
+        os: ['ubuntu-latest', 'windows-latest']
+        include:
+        - ruby: mingw
+          os: windows-latest
+        - ruby: mswin
+          os: windows-latest
+    runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v3
     - uses: ruby/setup-ruby@v1