diff --git a/.github/workflows/reviewdog.yml b/.github/workflows/reviewdog.yml
index 464efd7..da463d6 100644
--- a/.github/workflows/reviewdog.yml
+++ b/.github/workflows/reviewdog.yml
@@ -6,10 +6,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v1
-      - name: golangci-lint
-        uses: reviewdog/action-golangci-lint@v1
-        # uses: docker://reviewdog/action-golangci-lint:v1 # pre-build docker image
+        uses: actions/checkout@v4
         with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-          golangci_lint_flags: "--config=.golangci.yml ./..."
+          fetch-depth: 0
+      - name: golangci-lint
+        uses: reviewdog/action-golangci-lint@v2
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 19ca596..7b645e2 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,35 +1,25 @@
+name: test
+
 on:
   push:
-    branches:
-      - master
+    branches: ["master"]
   pull_request:
-name: test
+    branches: ["master"]
+
 jobs:
-  test:
-    strategy:
-      matrix:
-        platform: [ubuntu-latest]
-    env:
-      PIXELA_USER: ${{ secrets.PIXELA_USER }}
-      PIXELA_TOKEN: ${{ secrets.PIXELA_TOKEN }}
-    runs-on: ${{ matrix.platform }}
+  build-and-test:
+    runs-on: ubuntu-latest
     steps:
-    - name: Install Go
-      if: success()
-      uses: actions/setup-go@v2
-      with:
-        go-version: '^1.15' # The Go version to download (if necessary) and use.
-    - name: Checkout code
-      uses: actions/checkout@v2
-    - name: Use Cache
-      uses: actions/cache@v2
-      with:
-        path: ~/go/pkg/mod
-        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-        restore-keys: |
-          ${{ runner.os }}-go-
-    - name: Download Modules
-      if: steps.cache.outputs.cache-hit != 'true'
-      run: go mod download
-    - name: Run tests
-      run: go test -v -covermode=atomic
+      - uses: actions/checkout@v4
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: "go.mod"
+          cache: true
+      - name: Install dependencies
+        run: |
+          go get .
+      - name: Test
+        run: go test ./... -race -coverprofile=coverage.out -covermode=atomic
+      - name: Run octocov
+        uses: k1LoW/octocov-action@v1
diff --git a/.octocov.yml b/.octocov.yml
new file mode 100644
index 0000000..10a6f36
--- /dev/null
+++ b/.octocov.yml
@@ -0,0 +1,22 @@
+# generated by octocov init
+coverage:
+  if: true
+codeToTestRatio:
+  code:
+    - "**/*.go"
+    - "!**/*_test.go"
+  test:
+    - "**/*_test.go"
+testExecutionTime:
+  if: true
+diff:
+  datastores:
+    - artifact://${GITHUB_REPOSITORY}
+comment:
+  if: is_pull_request
+summary:
+  if: true
+report:
+  if: is_default_branch
+  datastores:
+    - artifact://${GITHUB_REPOSITORY}
diff --git a/go.mod b/go.mod
index eb33ef7..6d46f41 100644
--- a/go.mod
+++ b/go.mod
@@ -1,8 +1,13 @@
 module github.com/budougumi0617/nrseg
 
-go 1.15
+go 1.23
 
 require (
 	github.com/google/go-cmp v0.5.4
 	golang.org/x/tools v0.0.0-20210101214203-2dba1e4ea05c
 )
+
+require (
+	golang.org/x/mod v0.3.0 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+)