diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b4132a1..266bc59 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,7 +20,7 @@ jobs:
     runs-on: blacksmith-2vcpu-ubuntu-2404
     steps:
       - name: checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: setup
         uses: ./.github/actions/devenv
@@ -40,7 +40,7 @@ jobs:
     runs-on: blacksmith-2vcpu-ubuntu-2404
     steps:
       - name: checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: setup
         uses: ./.github/actions/devenv
@@ -100,7 +100,7 @@ jobs:
     runs-on: blacksmith-2vcpu-ubuntu-2404
     steps:
       - name: checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: setup
         uses: ./.github/actions/devenv
@@ -152,7 +152,7 @@ jobs:
     runs-on: blacksmith-2vcpu-ubuntu-2404
     steps:
       - name: checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: setup
         uses: ./.github/actions/devenv
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 18bf553..d452817 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: blacksmith-2vcpu-ubuntu-2404
     steps:
       - name: checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: setup
         uses: ./.github/actions/devenv