diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 16a994a..6833cd2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -42,6 +42,12 @@ jobs:
             ruby: mingw
           - os: ubuntu
             ruby: mswin
+          - os: windows
+            ruby: debug
+          - os: windows
+            ruby: truffleruby
+          - os: windows
+            ruby: truffleruby-head
     runs-on: ${{ matrix.os }}-latest
     continue-on-error: ${{ endsWith(matrix.ruby, 'head') || matrix.ruby == 'debug' }}
     steps: