diff --git a/.github/workflows/check-update.yml b/.github/workflows/check-update.yml
index 33a9a338a..048ce05c1 100644
--- a/.github/workflows/check-update.yml
+++ b/.github/workflows/check-update.yml
@@ -10,7 +10,7 @@ jobs:
     name: debian
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # setup ruby
       - uses: ruby/setup-ruby@v1
@@ -53,7 +53,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: debian
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # setup ruby
       - uses: ruby/setup-ruby@v1
@@ -95,7 +95,7 @@ jobs:
     name: debian-trixie
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # setup ruby
       - uses: ruby/setup-ruby@v1
@@ -138,7 +138,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: debian-trixie
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # setup ruby
       - uses: ruby/setup-ruby@v1
@@ -180,7 +180,7 @@ jobs:
     name: debian-bookworm
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # setup ruby
       - uses: ruby/setup-ruby@v1
@@ -223,7 +223,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: debian-bookworm
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # setup ruby
       - uses: ruby/setup-ruby@v1
diff --git a/.github/workflows/check-update.yml.erb b/.github/workflows/check-update.yml.erb
index 76888f888..1e46af0dc 100644
--- a/.github/workflows/check-update.yml.erb
+++ b/.github/workflows/check-update.yml.erb
@@ -15,7 +15,7 @@ jobs:
     needs: <%= image.sub(/^baseimage/, 'debian') %>
     <%- end -%>
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # setup ruby
       - uses: ruby/setup-ruby@v1
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e5a0c7f5e..0cc6c48c8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # setup ruby
       - uses: ruby/setup-ruby@v1
@@ -31,7 +31,7 @@ jobs:
       - run: sudo apt-get install -y --no-install-recommends pigz
 
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/baseimage:latest baseimage
 
       # setup ruby
@@ -68,7 +68,7 @@ jobs:
       - run: pigz -c -d /tmp/baseimage.tar.gz | docker load
 
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/ruby:latest ruby
 
       # setup ruby
@@ -105,7 +105,7 @@ jobs:
       - run: pigz -c -d /tmp/baseimage.tar.gz | docker load
 
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/nodejs:latest nodejs
 
       # setup ruby
@@ -139,7 +139,7 @@ jobs:
       - run: pigz -c -d /tmp/baseimage.tar.gz | docker load
 
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/es-kibana:latest es-kibana
 
       # setup ruby
@@ -176,7 +176,7 @@ jobs:
       - run: pigz -c -d /tmp/baseimage.tar.gz | docker load
 
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/systemd:latest systemd
 
       # setup ruby
@@ -210,7 +210,7 @@ jobs:
       - run: pigz -c -d /tmp/baseimage.tar.gz | docker load
 
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/squid:latest squid
 
       # setup ruby
@@ -244,7 +244,7 @@ jobs:
       - run: pigz -c -d /tmp/ruby.tar.gz | docker load
 
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/norikra:latest norikra
 
       # setup ruby
@@ -278,7 +278,7 @@ jobs:
       - run: pigz -c -d /tmp/ruby.tar.gz | docker load
 
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/ruby-full:latest ruby-full
 
       # setup ruby
@@ -312,7 +312,7 @@ jobs:
       - run: pigz -c -d /tmp/ruby.tar.gz | docker load
 
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/rails7:latest rails7
 
       # setup ruby
@@ -346,7 +346,7 @@ jobs:
       - run: pigz -c -d /tmp/ruby.tar.gz | docker load
 
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/tdiary:latest tdiary
 
       # setup ruby
@@ -371,7 +371,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # setup ruby
       - uses: ruby/setup-ruby@v1
@@ -394,7 +394,7 @@ jobs:
       - run: sudo apt-get install -y --no-install-recommends pigz
 
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/baseimage-trixie:latest baseimage-trixie
 
       # setup ruby
@@ -431,7 +431,7 @@ jobs:
       - run: pigz -c -d /tmp/baseimage-trixie.tar.gz | docker load
 
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/ruby-trixie:latest ruby-trixie
 
       # setup ruby
@@ -465,7 +465,7 @@ jobs:
       - run: pigz -c -d /tmp/baseimage-trixie.tar.gz | docker load
 
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/systemd-trixie:latest systemd-trixie
 
       # setup ruby
@@ -490,7 +490,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # setup ruby
       - uses: ruby/setup-ruby@v1
@@ -513,7 +513,7 @@ jobs:
       - run: sudo apt-get install -y --no-install-recommends pigz
 
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/baseimage-bookworm:latest baseimage-bookworm
 
       # setup ruby
@@ -550,7 +550,7 @@ jobs:
       - run: pigz -c -d /tmp/baseimage-bookworm.tar.gz | docker load
 
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/ruby-bookworm:latest ruby-bookworm
 
       # setup ruby
@@ -584,7 +584,7 @@ jobs:
       - run: pigz -c -d /tmp/baseimage-bookworm.tar.gz | docker load
 
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/systemd-bookworm:latest systemd-bookworm
 
       # setup ruby
diff --git a/.github/workflows/ci.yml.erb b/.github/workflows/ci.yml.erb
index 5ff0bf1e1..d2164eee1 100644
--- a/.github/workflows/ci.yml.erb
+++ b/.github/workflows/ci.yml.erb
@@ -62,10 +62,10 @@ images = {
       <%- end -%>
       <%- if image_conf[:build_image] -%>
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/<%= image %>:latest <%= image %>
       <%- else -%>
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       <%- end -%>
 
       # setup ruby