diff --git a/.github/workflows/add.yml b/.github/workflows/add.yml
index 2611f0c..0882a48 100644
--- a/.github/workflows/add.yml
+++ b/.github/workflows/add.yml
@@ -35,7 +35,7 @@ jobs:
       idx-checkout-path: idx-pages
     steps:
       - name: checkout index branch
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
         with:
           path: ${{ env.idx-checkout-path }}
           ref: ${{ inputs.index-branch }}
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index c7ffd3d..45d0232 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -20,12 +20,12 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           ref: gh-pages
       # write index htmls into `simple` dir
       # jekyII should keep `simple` dir
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           ref: ${{ env.idx-checkout-path }}
           path: simple
diff --git a/.github/workflows/remove.yml b/.github/workflows/remove.yml
index e9cf153..ae8c37d 100644
--- a/.github/workflows/remove.yml
+++ b/.github/workflows/remove.yml
@@ -34,7 +34,7 @@ jobs:
       idx-checkout-path: index
     steps:
       - name: checkout index branch
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
         with:
           path: ${{ env.idx-checkout-path }}
           ref: ${{ inputs.index-branch }}