diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6bc9f16..ae57a5c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -56,6 +56,7 @@ jobs:
   build-on-windows:
     runs-on: windows-latest
     steps:
+    - run: npx.cmd -p @mermaid-js/mermaid-cli mmdc
     - uses: actions/checkout@v4
     - name: Set up JDK 11
       uses: actions/setup-java@v4