diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index 9255075..26164ae 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     name: check misspelling by typos
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: cachix/install-nix-action@v31
       - name: Run typos command
         shell: nix shell nixpkgs#typos --quiet --command bash {0}
@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     name: lint opentofu code by tflint
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: cachix/install-nix-action@v31
       - name: Run tflint command
         shell: nix shell nixpkgs#tflint --quiet --command bash {0}
@@ -33,7 +33,7 @@ jobs:
       run:
         working-directory: ./infra # Set working directory for apply job.
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: opentofu/setup-opentofu@v1
       - name: Run OpenTofu commands
         env:
@@ -50,7 +50,7 @@ jobs:
     permissions:
       security-events: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Run Trivy vulnerability scanner in repo mode
         uses: aquasecurity/trivy-action@0.33.1
         with:
@@ -75,7 +75,7 @@ jobs:
     permissions:
       security-events: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Run Trivy vulnerability scanner in repo mode
         uses: aquasecurity/trivy-action@0.33.1
         with:
diff --git a/.github/workflows/infra-apply.yml b/.github/workflows/infra-apply.yml
index 1b51c59..360ab70 100644
--- a/.github/workflows/infra-apply.yml
+++ b/.github/workflows/infra-apply.yml
@@ -27,7 +27,7 @@ jobs:
       run:
         working-directory: ./infra # Set working directory for apply job.
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: opentofu/setup-opentofu@v1
       - name: Run OpenTofu commands
         env:
@@ -63,7 +63,7 @@ jobs:
       run:
         working-directory: ./infra # Set working directory for apply job.
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Download encrypted plan artifact
         uses: actions/download-artifact@v6
         with:
diff --git a/.github/workflows/infra-destroy.yml b/.github/workflows/infra-destroy.yml
index cba6b7a..5586b9f 100644
--- a/.github/workflows/infra-destroy.yml
+++ b/.github/workflows/infra-destroy.yml
@@ -17,7 +17,7 @@ jobs:
       run:
         working-directory: ./infra # Set working directory for apply job.
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: opentofu/setup-opentofu@v1
       - name: Run OpenTofu commands
         env:
@@ -52,7 +52,7 @@ jobs:
       run:
         working-directory: ./infra # Set working directory for apply job.
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Download encrypted plan artifact
         uses: actions/download-artifact@v6
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 36a4c67..5be3c1a 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -13,7 +13,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0 # Fetch all history.
           filter: blob:none