diff --git a/.github/workflows/create-release.yml b/.github/workflows/create-release.yml
index bec4982..7e78fa4 100644
--- a/.github/workflows/create-release.yml
+++ b/.github/workflows/create-release.yml
@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
diff --git a/.github/workflows/debug-triggers.yml b/.github/workflows/debug-triggers.yml
index c86c473..e939f67 100644
--- a/.github/workflows/debug-triggers.yml
+++ b/.github/workflows/debug-triggers.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/deploy-docs.yml b/.github/workflows/deploy-docs.yml
index c1fdcc0..0a451a1 100644
--- a/.github/workflows/deploy-docs.yml
+++ b/.github/workflows/deploy-docs.yml
@@ -40,7 +40,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0 # Fetch all history for proper git information
           token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/docker-build.yml b/.github/workflows/docker-build.yml
index e967f36..4d53f7d 100644
--- a/.github/workflows/docker-build.yml
+++ b/.github/workflows/docker-build.yml
@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
 
diff --git a/.github/workflows/jiro-kernel-ci.yml b/.github/workflows/jiro-kernel-ci.yml
index c977642..65bd266 100644
--- a/.github/workflows/jiro-kernel-ci.yml
+++ b/.github/workflows/jiro-kernel-ci.yml
@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
 
diff --git a/.github/workflows/jiro-kernel-performance.yml b/.github/workflows/jiro-kernel-performance.yml
index e3113f8..5667b51 100644
--- a/.github/workflows/jiro-kernel-performance.yml
+++ b/.github/workflows/jiro-kernel-performance.yml
@@ -22,7 +22,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup .NET Project
         uses: ./.github/actions/setup-dotnet-project
diff --git a/.github/workflows/jiro-kernel-security.yml b/.github/workflows/jiro-kernel-security.yml
index f0f24ea..1208e11 100644
--- a/.github/workflows/jiro-kernel-security.yml
+++ b/.github/workflows/jiro-kernel-security.yml
@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup .NET Project (restore only)
         uses: ./.github/actions/setup-dotnet-project
diff --git a/.github/workflows/markdown-lint.yml b/.github/workflows/markdown-lint.yml
index 5ebcf82..211b6dd 100644
--- a/.github/workflows/markdown-lint.yml
+++ b/.github/workflows/markdown-lint.yml
@@ -21,7 +21,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
 
diff --git a/.github/workflows/security-scan.yml b/.github/workflows/security-scan.yml
index 632c09e..b3980fa 100644
--- a/.github/workflows/security-scan.yml
+++ b/.github/workflows/security-scan.yml
@@ -21,7 +21,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
 
diff --git a/.github/workflows/simple-test.yml b/.github/workflows/simple-test.yml
index a75442a..60259d4 100644
--- a/.github/workflows/simple-test.yml
+++ b/.github/workflows/simple-test.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Simple test
         run: |