diff --git a/.github/workflows/publish-bungeesemaphore-redis-dev.yml b/.github/workflows/publish-bungeesemaphore-redis-dev.yml
index 9e59d09..e7ceccb 100644
--- a/.github/workflows/publish-bungeesemaphore-redis-dev.yml
+++ b/.github/workflows/publish-bungeesemaphore-redis-dev.yml
@@ -16,7 +16,7 @@ jobs:
     # 参考: https://qiita.com/kawakawaryuryu/items/b0291c1bc1141a535263
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
         with:
           submodules: recursive
 
diff --git a/.github/workflows/publish-seichiassist-builder-v2.yml b/.github/workflows/publish-seichiassist-builder-v2.yml
index 693a85d..ce89e85 100644
--- a/.github/workflows/publish-seichiassist-builder-v2.yml
+++ b/.github/workflows/publish-seichiassist-builder-v2.yml
@@ -16,7 +16,7 @@ jobs:
     # 参考: https://qiita.com/kawakawaryuryu/items/b0291c1bc1141a535263
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
         with:
           submodules: recursive
 
diff --git a/.github/workflows/publish-seichiassist-builder.yml b/.github/workflows/publish-seichiassist-builder.yml
index c0ca359..7d5effc 100644
--- a/.github/workflows/publish-seichiassist-builder.yml
+++ b/.github/workflows/publish-seichiassist-builder.yml
@@ -16,7 +16,7 @@ jobs:
     # 参考: https://qiita.com/kawakawaryuryu/items/b0291c1bc1141a535263
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
         with:
           submodules: recursive
 
diff --git a/.github/workflows/publish-seichiassist-runner-v2.yml b/.github/workflows/publish-seichiassist-runner-v2.yml
index 4d83c88..51689bc 100644
--- a/.github/workflows/publish-seichiassist-runner-v2.yml
+++ b/.github/workflows/publish-seichiassist-runner-v2.yml
@@ -16,7 +16,7 @@ jobs:
     # 参考: https://qiita.com/kawakawaryuryu/items/b0291c1bc1141a535263
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
         with:
           submodules: recursive
 
diff --git a/.github/workflows/publish-seichiassist-runner.yml b/.github/workflows/publish-seichiassist-runner.yml
index 2b59b98..7185850 100644
--- a/.github/workflows/publish-seichiassist-runner.yml
+++ b/.github/workflows/publish-seichiassist-runner.yml
@@ -16,7 +16,7 @@ jobs:
     # 参考: https://qiita.com/kawakawaryuryu/items/b0291c1bc1141a535263
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
         with:
           submodules: recursive