diff --git a/.github/workflows/generate_pdf.yaml b/.github/workflows/generate_pdf.yaml
index ede4285..950ba03 100644
--- a/.github/workflows/generate_pdf.yaml
+++ b/.github/workflows/generate_pdf.yaml
@@ -23,7 +23,7 @@ jobs:
       run: npm run build
 
     - name: Upload PDF as artifact
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: pdf-artifact
         path: .vivliostyle/output.pdf
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