diff --git a/.github/workflows/go-lint.yml b/.github/workflows/go-lint.yml
index e470e51..24d2c63 100644
--- a/.github/workflows/go-lint.yml
+++ b/.github/workflows/go-lint.yml
@@ -46,7 +46,7 @@ jobs:
     name: Run golangci-lint
     runs-on: ubuntu-latest # ref. https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-syntax-for-github-actions#jobsjob_idruns-on
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: DEBUG
         shell: bash
         run: |
@@ -61,7 +61,7 @@ jobs:
           ================================================================
           DEBUG_DOC
       - name: actions/cache for versenv
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.cache/versenv
@@ -85,7 +85,7 @@ jobs:
           # Setup versenv
           direnv allow ${{ env.WORKDIR }}
           make versenv
-      - uses: actions/setup-go@v5 # ref. https://github.com/actions/setup-go#usage
+      - uses: actions/setup-go@v6 # ref. https://github.com/actions/setup-go#usage
         id: setup-go
         with:
           cache: false
@@ -97,7 +97,7 @@ jobs:
           echo "GOVERSION=$(go version | cut -d' ' -f3)" >> "$GITHUB_OUTPUT"
           echo "GOCACHE=$(go env GOCACHE)" >> "$GITHUB_OUTPUT"
       - name: actions/cache for go
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/go/pkg/mod
@@ -119,7 +119,7 @@ jobs:
           if [ -n "${GITHUB_TOKEN-}" ]; then
             direnv exec . bash -Eeux -o pipefail -c 'echo "${GOPRIVATE:-}${GOPRIVATE+,}" | while read -d , -r LINE; do echo "set git config: ${LINE}"; git config --global url."https://${GITHUB_TOKEN}:x-oauth-basic@${LINE}".insteadOf "https://${LINE}"; done'
           fi
-      - uses: golangci/golangci-lint-action@v6.0.1 # ref. https://github.com/golangci/golangci-lint-action#how-to-use
+      - uses: golangci/golangci-lint-action@v9.2.0 # ref. https://github.com/golangci/golangci-lint-action#how-to-use
         with:
           working-directory: ${{ env.WORKDIR }}
           args: --timeout=600s
diff --git a/.github/workflows/go-mod-tidy.yml b/.github/workflows/go-mod-tidy.yml
index 5f85409..98fcf82 100644
--- a/.github/workflows/go-mod-tidy.yml
+++ b/.github/workflows/go-mod-tidy.yml
@@ -40,7 +40,7 @@ jobs:
       contents: write
     runs-on: ubuntu-latest # ref. https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-syntax-for-github-actions#jobsjob_idruns-on
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.ref }} # needed for gh pr view
       - name: DEBUG
@@ -57,7 +57,7 @@ jobs:
           ================================================================
           DEBUG_DOC
       - name: actions/cache for versenv
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.cache/versenv
@@ -81,7 +81,7 @@ jobs:
           # Setup versenv
           direnv allow ${{ env.WORKDIR }}
           make versenv
-      - uses: actions/setup-go@v5 # ref. https://github.com/actions/setup-go#usage
+      - uses: actions/setup-go@v6 # ref. https://github.com/actions/setup-go#usage
         id: setup-go
         with:
           cache: false
@@ -93,7 +93,7 @@ jobs:
           echo "GOVERSION=$(go version | cut -d' ' -f3)" >> "$GITHUB_OUTPUT"
           echo "GOCACHE=$(go env GOCACHE)" >> "$GITHUB_OUTPUT"
       - name: actions/cache for go
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/go/pkg/mod
diff --git a/.github/workflows/go-test.yml b/.github/workflows/go-test.yml
index 3f5516b..bc14175 100644
--- a/.github/workflows/go-test.yml
+++ b/.github/workflows/go-test.yml
@@ -46,7 +46,7 @@ jobs:
     name: Run go test
     runs-on: ubuntu-latest # ref. https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-syntax-for-github-actions#jobsjob_idruns-on
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: DEBUG
         shell: bash
         run: |
@@ -61,7 +61,7 @@ jobs:
           ================================================================
           DEBUG_DOC
       - name: actions/cache for versenv
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.cache/versenv
@@ -83,7 +83,7 @@ jobs:
           # Setup versenv
           direnv allow ${{ env.WORKDIR }}
           make versenv
-      - uses: actions/setup-go@v5 # ref. https://github.com/actions/setup-go#usage
+      - uses: actions/setup-go@v6 # ref. https://github.com/actions/setup-go#usage
         id: setup-go
         with:
           cache: false
@@ -95,7 +95,7 @@ jobs:
           echo "GOVERSION=$(go version | cut -d' ' -f3)" >> "$GITHUB_OUTPUT"
           echo "GOCACHE=$(go env GOCACHE)" >> "$GITHUB_OUTPUT"
       - name: actions/cache for go
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/go/pkg/mod
@@ -127,7 +127,7 @@ jobs:
           set -Eeu -o pipefail -x
           direnv allow .
           direnv exec . make test
-      - uses: codecov/codecov-action@v4 # ref. https://github.com/codecov/codecov-action#example-workflowyml-with-codecov-action
+      - uses: codecov/codecov-action@v5 # ref. https://github.com/codecov/codecov-action#example-workflowyml-with-codecov-action
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: ${{ env.WORKDIR }}/coverage.txt
diff --git a/.github/workflows/label-checker.yml b/.github/workflows/label-checker.yml
index 7e44dd0..a7fd059 100644
--- a/.github/workflows/label-checker.yml
+++ b/.github/workflows/label-checker.yml
@@ -45,7 +45,7 @@ jobs:
       checks: read
       repository-projects: read
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.ref }} # needed for gh pr view
       - name: Check labels