diff --git a/.github/workflows/test-action.yml b/.github/workflows/test-action.yml
index c9e3c86..0f4b9c3 100644
--- a/.github/workflows/test-action.yml
+++ b/.github/workflows/test-action.yml
@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup mdBook
-        uses: peaceiris/actions-mdbook@v1
+        uses: peaceiris/actions-mdbook@v1.1.14
         with:
           mdbook-version: ${{ matrix.mdbook-version }}