diff --git a/.github/workflows/build-pdf.yml b/.github/workflows/build-pdf.yml
index 6d50bdb..b407776 100644
--- a/.github/workflows/build-pdf.yml
+++ b/.github/workflows/build-pdf.yml
@@ -19,7 +19,7 @@ jobs:
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - name: Set up Git repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Cache
         uses: actions/cache@v2.1.1
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index f8cbe7a..a0f2354 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -16,7 +16,7 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ github.token }}
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Github Action for LaTeX
         # You may pin to the exact commit or the version.
         # uses: xu-cheng/latex-action@dacf2cfbdd5fd768c2298cbdc9e105bd9ed7f293