diff --git a/.github/workflows/book-build.yml b/.github/workflows/book-build.yml
index 5a1887b..a290790 100644
--- a/.github/workflows/book-build.yml
+++ b/.github/workflows/book-build.yml
@@ -237,7 +237,7 @@ jobs:
     if: github.event_name == 'release' || startsWith(github.ref, 'refs/tags/')
     steps:
       - name: Download PDF artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           name: ${{ needs.build-pdf.outputs.pdf_name }}
           path: ./pdf-output
@@ -281,7 +281,7 @@ jobs:
     if: github.event_name == 'push' && (github.ref == 'refs/heads/master' || github.ref == 'refs/heads/main')
     steps:
       - name: Download PDF artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           name: ${{ needs.build-pdf.outputs.pdf_name }}
           path: ./pdf-output