diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index aa2d3997..635a87db 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -88,9 +88,8 @@ jobs:
       - name: Install dependencies
         run: yarn
 
-      # Node 20対応がリリースされておらず、https://github.com/peaceiris/actions-mdbook/pull/500 のマージ待ち
       - name: Setup mdBook
-        uses: peaceiris/actions-mdbook@v1.2.0
+        uses: peaceiris/actions-mdbook@v2.0.0
         with:
           mdbook-version: "latest"