diff --git a/.github/workflows/create-release-tag.yaml b/.github/workflows/create-release-tag.yaml
index 0eeff775..558b0302 100644
--- a/.github/workflows/create-release-tag.yaml
+++ b/.github/workflows/create-release-tag.yaml
@@ -17,7 +17,7 @@ jobs:
     outputs:
       version: ${{ steps.extract-version.outputs.version }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # Extract the version number from the source branch.
       - name: Extract version
@@ -36,7 +36,7 @@ jobs:
     # Execute when the version extraction job is completed.
     needs: extract-version
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # Check if the release tag for the version already exists.
       - name: Check if tag exists
diff --git a/.github/workflows/deploy-ios-production-app.yaml b/.github/workflows/deploy-ios-production-app.yaml
index baffdcb4..c0a3fd31 100644
--- a/.github/workflows/deploy-ios-production-app.yaml
+++ b/.github/workflows/deploy-ios-production-app.yaml
@@ -20,7 +20,7 @@ jobs:
       CERTIFICATES_P12: ${{ secrets.CERTIFICATES_P12 }}
       CERTIFICATES_P12_PASSWORD: ${{ secrets.CERTIFICATES_P12_PASSWORD }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Setup Flutter with FVM
         uses: kuhnroyal/flutter-fvm-config-action/setup@v3
diff --git a/.github/workflows/deploy-ios-staging-app.yaml b/.github/workflows/deploy-ios-staging-app.yaml
index 0fe15223..1d88608d 100644
--- a/.github/workflows/deploy-ios-staging-app.yaml
+++ b/.github/workflows/deploy-ios-staging-app.yaml
@@ -20,7 +20,7 @@ jobs:
       CERTIFICATES_P12: ${{ secrets.CERTIFICATES_P12 }}
       CERTIFICATES_P12_PASSWORD: ${{ secrets.CERTIFICATES_P12_PASSWORD }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Setup Flutter with FVM
         uses: kuhnroyal/flutter-fvm-config-action/setup@v3
diff --git a/.github/workflows/flutter-app-code-check.yml b/.github/workflows/flutter-app-code-check.yml
index 3547092a..de715c09 100644
--- a/.github/workflows/flutter-app-code-check.yml
+++ b/.github/workflows/flutter-app-code-check.yml
@@ -20,7 +20,7 @@ jobs:
       flutter: ${{ steps.filter.outputs.flutter }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Filter by paths
         uses: dorny/paths-filter@v3
@@ -48,7 +48,7 @@ jobs:
     timeout-minutes: 20
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup Flutter with FVM
         id: setup-flutter
@@ -79,7 +79,7 @@ jobs:
     timeout-minutes: 20
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup Flutter with FVM
         id: setup-flutter
diff --git a/.github/workflows/lint-github-actions-workflows.yaml b/.github/workflows/lint-github-actions-workflows.yaml
index 1a46950a..08149e4f 100644
--- a/.github/workflows/lint-github-actions-workflows.yaml
+++ b/.github/workflows/lint-github-actions-workflows.yaml
@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Download actionlint
         id: get_actionlint
         run: bash <(curl https://raw.githubusercontent.com/rhysd/actionlint/main/scripts/download-actionlint.bash)
diff --git a/.github/workflows/upload-production-android-app.yaml b/.github/workflows/upload-production-android-app.yaml
index c59561ca..56cbe66c 100644
--- a/.github/workflows/upload-production-android-app.yaml
+++ b/.github/workflows/upload-production-android-app.yaml
@@ -20,7 +20,7 @@ jobs:
       KEY_PASSWORD: ${{ secrets.KEY_PASSWORD }}
       KEY_ALIAS: ${{ secrets.KEY_ALIAS }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Setup Flutter with FVM
         uses: kuhnroyal/flutter-fvm-config-action/setup@v3
diff --git a/.github/workflows/upload-staging-android-app.yaml b/.github/workflows/upload-staging-android-app.yaml
index cc94ee9b..98355ff0 100644
--- a/.github/workflows/upload-staging-android-app.yaml
+++ b/.github/workflows/upload-staging-android-app.yaml
@@ -20,7 +20,7 @@ jobs:
       KEY_PASSWORD: ${{ secrets.KEY_PASSWORD }}
       KEY_ALIAS: ${{ secrets.KEY_ALIAS }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Setup Flutter with FVM
         uses: kuhnroyal/flutter-fvm-config-action/setup@v3