diff --git a/.github/workflows/go.yaml b/.github/workflows/go.yaml
new file mode 100644
index 0000000..4f7ddf8
--- /dev/null
+++ b/.github/workflows/go.yaml
@@ -0,0 +1,41 @@
+name: Go
+
+on:
+  pull_request:
+    branches:
+      - main
+      - master
+      - release/v*
+      - test-workflow-main
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version: "1.22.12"
+
+      - name: Lint with golangci-lint
+        uses: golangci/golangci-lint-action@v8
+        with:
+          version: v2.5.0
+          only-new-issues: true
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version: "1.22.12"
+
+      - name: Run go test
+        run: go test -v ./...
diff --git a/.golangci.yaml b/.golangci.yaml
new file mode 100644
index 0000000..8891809
--- /dev/null
+++ b/.golangci.yaml
@@ -0,0 +1,101 @@
+# https://golangci-lint.run/docs/configuration/file/
+version: "2"
+
+run:
+  timeout: 5m
+
+issues:
+  new: true
+  whole-files: true
+  new-from-rev: HEAD~
+  max-same-issues: 50
+
+severity:
+  default: error
+  # rules:
+  #   - linters:
+  #       - dupl
+  #     severity: error
+
+formatters:
+  enable:
+    - gci
+    - gofmt
+    - gofumpt
+    - goimports
+    - golines
+    - swaggo
+  settings:
+    gofmt:
+      rewrite-rules:
+        - pattern: "interface{}"
+          replacement: "any"
+    gofumpt:
+      extra-rules: true
+  exclusions:
+    paths: []
+
+linters:
+  default: none
+  enable:
+    # Standard
+    - errcheck
+    - govet
+    - ineffassign
+    - staticcheck
+    - unused
+
+    # Additional
+    - bodyclose
+    - depguard
+    - errname
+    - errorlint
+    - gocognit
+    - goconst
+    - goheader
+    - gomodguard
+    - goprintffuncname
+    - gosec
+    - nakedret
+    - nilerr
+    - nilnil
+    - noctx
+    - nolintlint
+    - prealloc
+    - promlinter
+    - revive
+    - testifylint
+    - testpackage
+    - thelper
+    - usestdlibvars
+    - wastedassign
+    - wsl_v5
+
+  disable: []
+
+  settings:
+    depguard:
+      rules:
+        main:
+          deny:
+            - pkg: github.com/pkg/errors
+              desc: Should be replaced by standard lib errors package
+            - pkg: golang.org/x/exp/slices
+              desc: Should be replaced by standard lib slices package
+            - pkg: github.com/go-resty/resty$
+              desc: Use github.com/go-resty/resty/v2 instead
+            - pkg: github.com/aws/smithy-go/ptr$
+              desc: Use github.com/aws/aws-sdk-go-v2/aws instead
+    govet:
+      enable:
+        - nilness
+
+  # exclusions:
+  #   paths:
+  #     - (.+)_test\.go
+  #   rules:
+  #     - path: (.+)_test\.go
+  #       linters:
+  #         - dupl
+  #         - mnd
+  #         - lll
diff --git a/.tool-versions b/.tool-versions
index 76c9a78..a0cffcc 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,2 +1,2 @@
-golang 1.22.7
-golangci-lint 1.60.3
+golang 1.22.12
+golangci-lint 2.5.0
diff --git a/Makefile b/Makefile
index 25982e5..ae95376 100644
--- a/Makefile
+++ b/Makefile
@@ -1,23 +1,27 @@
-MODULE_DIRS = . ./tools
+MODULE_DIRS = .
 
 gowork:
-	go work init . ./tools
+	go work init .
 
 tidy:
-	$(foreach dir,$(MODULE_DIRS), \
-		(cd $(dir) && go mod tidy) &&) true
+	go mod tidy
 
-install: tidy
-	cd tools && go install \
-		mvdan.cc/gofumpt
+install-asdf:
+	asdf install
+
+install: install-asdf tidy
+# 	curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/HEAD/install.sh | sh -s -- -b $(shell go env GOPATH)/bin v2.5.0
 
 fmt: install
-	gofumpt -l -w -extra .
+	golangci-lint fmt -v ./...
+
+fix: install
+	golangci-lint run -v --fix ./...
 
 lint: install
-	golangci-lint run ./...
+	golangci-lint run -v ./...
 
-test:
+test: install
 	go test ./...
 
-check: fmt lint test
+check: fix lint test
diff --git a/errgroup.go b/errgroup.go
index fa37351..287bd40 100644
--- a/errgroup.go
+++ b/errgroup.go
@@ -1,7 +1,10 @@
+// Package errgroup provides a more robust error group implementation
+// that extends golang.org/x/sync/errgroup with panic recovery.
 package errgroup
 
 import (
 	"context"
+	"errors"
 
 	"golang.org/x/sync/errgroup"
 )
@@ -61,7 +64,9 @@ func (g *Group) TryGo(f func() error) bool {
 // returns the first non-nil error (if any) from them.
 func (g *Group) Wait() error {
 	err := g.g.Wait()
-	if p, ok := err.(panicked); ok {
+
+	var p panicked
+	if errors.As(err, &p) {
 		// re-panic to keep the original stack trace
 		panic(p.panic)
 	}
diff --git a/errgroup_test.go b/errgroup_test.go
index e6dec8b..7a76f0a 100644
--- a/errgroup_test.go
+++ b/errgroup_test.go
@@ -8,6 +8,7 @@ import (
 
 	"github.com/min0625/errgroup"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func Test_Group(t *testing.T) {
@@ -32,9 +33,9 @@ func Test_Group(t *testing.T) {
 		return nil
 	})
 
-	assert.NoError(t, g.Wait())
-	assert.Equal(t, jobXIsDone, true)
-	assert.Equal(t, jobYIsDone, true)
+	require.NoError(t, g.Wait())
+	assert.True(t, jobXIsDone)
+	assert.True(t, jobYIsDone)
 }
 
 func Test_WithContext(t *testing.T) {
@@ -61,8 +62,8 @@ func Test_WithContext(t *testing.T) {
 		return nil
 	})
 
-	assert.ErrorIs(t, g.Wait(), myErr)
-	assert.Equal(t, jobIsCanceled, true)
+	require.ErrorIs(t, g.Wait(), myErr)
+	assert.True(t, jobIsCanceled, true)
 }
 
 func Test_Group_Error(t *testing.T) {
diff --git a/example_test.go b/example_test.go
index ff3c766..020020f 100644
--- a/example_test.go
+++ b/example_test.go
@@ -35,6 +35,8 @@ func Example() {
 
 	if err := g.Wait(); err != nil {
 		// Handle error
+		fmt.Println(err)
+		return
 	}
 
 	// Output: oops
diff --git a/go.mod b/go.mod
index 278c38f..5c897d3 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/min0625/errgroup
 
-go 1.22.7
+go 1.22.12
 
 require (
 	github.com/stretchr/testify v1.9.0
diff --git a/tools/go.mod b/tools/go.mod
deleted file mode 100644
index 8b24bcb..0000000
--- a/tools/go.mod
+++ /dev/null
@@ -1,12 +0,0 @@
-module github.com/min0625/json-arr/tools
-
-go 1.22.7
-
-require mvdan.cc/gofumpt v0.7.0
-
-require (
-	github.com/google/go-cmp v0.6.0 // indirect
-	golang.org/x/mod v0.14.0 // indirect
-	golang.org/x/sync v0.6.0 // indirect
-	golang.org/x/tools v0.17.0 // indirect
-)
diff --git a/tools/go.sum b/tools/go.sum
deleted file mode 100644
index 856e4a5..0000000
--- a/tools/go.sum
+++ /dev/null
@@ -1,20 +0,0 @@
-github.com/go-quicktest/qt v1.101.0 h1:O1K29Txy5P2OK0dGo59b7b0LR6wKfIhttaAhHUyn7eI=
-github.com/go-quicktest/qt v1.101.0/go.mod h1:14Bz/f7NwaXPtdYEgzsx46kqSxVwTbzVZsDC26tQJow=
-github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
-github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
-github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
-github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
-github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
-github.com/rogpeppe/go-internal v1.12.0 h1:exVL4IDcn6na9z1rAb56Vxr+CgyK3nn3O+epU5NdKM8=
-github.com/rogpeppe/go-internal v1.12.0/go.mod h1:E+RYuTGaKKdloAfM02xzb0FW3Paa99yedzYV+kq4uf4=
-golang.org/x/mod v0.14.0 h1:dGoOF9QVLYng8IHTm7BAyWqCqSheQ5pYWGhzW00YJr0=
-golang.org/x/mod v0.14.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
-golang.org/x/sync v0.6.0 h1:5BMeUDZ7vkXGfEr1x9B4bRcTH4lpkTkpdh0T/J+qjbQ=
-golang.org/x/sync v0.6.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
-golang.org/x/sys v0.16.0 h1:xWw16ngr6ZMtmxDyKyIgsE93KNKz5HKmMa3b8ALHidU=
-golang.org/x/sys v0.16.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/tools v0.17.0 h1:FvmRgNOcs3kOa+T20R1uhfP9F6HgG2mfxDv1vrx1Htc=
-golang.org/x/tools v0.17.0/go.mod h1:xsh6VxdV005rRVaS6SSAf9oiAqljS7UZUacMZ8Bnsps=
-mvdan.cc/gofumpt v0.7.0 h1:bg91ttqXmi9y2xawvkuMXyvAA/1ZGJqYAEGjXuP0JXU=
-mvdan.cc/gofumpt v0.7.0/go.mod h1:txVFJy/Sc/mvaycET54pV8SW8gWxTlUuGHVEcncmNUo=
diff --git a/tools/tools.go b/tools/tools.go
deleted file mode 100644
index de6f5cf..0000000
--- a/tools/tools.go
+++ /dev/null
@@ -1,8 +0,0 @@
-//go:build tools
-// +build tools
-
-package tools
-
-import (
-	_ "mvdan.cc/gofumpt"
-)