diff --git a/.github/workflows/releasenotes_pdf.yml b/.github/workflows/releasenotes_pdf.yml
index 908650b..cdd2abc 100644
--- a/.github/workflows/releasenotes_pdf.yml
+++ b/.github/workflows/releasenotes_pdf.yml
@@ -12,7 +12,7 @@ jobs:
     
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         
       - name: Install Pandoc
         run: |