diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index eed4da1..c5ab3af 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -22,5 +22,5 @@ jobs:
     - name: golangci-lint
       uses: golangci/golangci-lint-action@v3
       with:
-        version: v1.51.1
+        version: v1.54.2
         args: --timeout=5m
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index ac0d289..2f3a0fc 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -39,7 +39,7 @@ jobs:
       fail-fast: false
       matrix:
         terraform:
-        - 1.5.0
+        - 1.5.5
         - 1.4.6
         - 1.3.9
         - 0.12.31
diff --git a/.go-version b/.go-version
index 5fb5a6b..d2ab029 100644
--- a/.go-version
+++ b/.go-version
@@ -1 +1 @@
-1.20
+1.21
diff --git a/Dockerfile b/Dockerfile
index 85001bf..72daf78 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 ARG TERRAFORM_VERSION=latest
 FROM hashicorp/terraform:$TERRAFORM_VERSION AS terraform
 
-FROM golang:1.20-alpine3.17
+FROM golang:1.21-alpine3.18
 RUN apk --no-cache add make git bash
 COPY --from=terraform /bin/terraform /usr/local/bin/
 WORKDIR /work
diff --git a/README.md b/README.md
index 20c303e..5147bd0 100644
--- a/README.md
+++ b/README.md
@@ -276,7 +276,7 @@ https://github.com/minamijoyo/tfmigrate/releases
 
 ### Source
 
-If you have Go 1.20+ development environment:
+If you have Go 1.21+ development environment:
 
 ```
 $ git clone https://github.com/minamijoyo/tfmigrate
diff --git a/go.mod b/go.mod
index bfd2aaa..bd87f76 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/minamijoyo/tfmigrate
 
-go 1.20
+go 1.21
 
 require (
 	cloud.google.com/go/storage v1.25.0
diff --git a/history/controller_test.go b/history/controller_test.go
index e86b09f..defc6a3 100644
--- a/history/controller_test.go
+++ b/history/controller_test.go
@@ -540,12 +540,14 @@ func TestControllerAddRecord(t *testing.T) {
 
 	for _, tc := range cases {
 		t.Run(tc.desc, func(t *testing.T) {
+			currentTC := tc
+
 			c := &Controller{
 				migrations: tc.migrations,
 				history:    tc.history,
 			}
 
-			c.AddRecord(tc.filename, tc.migrationType, tc.name, &tc.appliedAt)
+			c.AddRecord(tc.filename, tc.migrationType, currentTC.name, &currentTC.appliedAt)
 			got := tc.history
 			if diff := cmp.Diff(got, tc.want, cmp.AllowUnexported(got)); diff != "" {
 				t.Errorf("got = %#v, want = %#v, diff = %s", got, tc.want, diff)
diff --git a/storage/gcs/storage_test.go b/storage/gcs/storage_test.go
index e3dd619..4623dbc 100644
--- a/storage/gcs/storage_test.go
+++ b/storage/gcs/storage_test.go
@@ -13,11 +13,11 @@ type mockClient struct {
 	err        error
 }
 
-func (c *mockClient) Read(ctx context.Context) ([]byte, error) {
+func (c *mockClient) Read(_ context.Context) ([]byte, error) {
 	return c.dataToRead, c.err
 }
 
-func (c *mockClient) Write(ctx context.Context, b []byte) error {
+func (c *mockClient) Write(_ context.Context, _ []byte) error {
 	return c.err
 }
 
diff --git a/storage/local/storage.go b/storage/local/storage.go
index 9319c18..b798f6e 100644
--- a/storage/local/storage.go
+++ b/storage/local/storage.go
@@ -27,7 +27,7 @@ func NewStorage(config *Config) (*Storage, error) {
 }
 
 // Write writes migration history data to storage.
-func (s *Storage) Write(ctx context.Context, b []byte) error {
+func (s *Storage) Write(_ context.Context, b []byte) error {
 	// nolint gosec
 	// G306: Expect WriteFile permissions to be 0600 or less
 	// We ignore it because a history file doesn't contains sensitive data.
@@ -38,7 +38,7 @@ func (s *Storage) Write(ctx context.Context, b []byte) error {
 // Read reads migration history data from storage.
 // If the key does not exist, it is assumed to be uninitialized and returns
 // an empty array instead of an error.
-func (s *Storage) Read(ctx context.Context) ([]byte, error) {
+func (s *Storage) Read(_ context.Context) ([]byte, error) {
 	if _, err := os.Stat(s.config.Path); os.IsNotExist(err) {
 		// If the key does not exist
 		return []byte{}, nil
diff --git a/storage/mock/storage.go b/storage/mock/storage.go
index afa15d7..fe2a964 100644
--- a/storage/mock/storage.go
+++ b/storage/mock/storage.go
@@ -33,7 +33,7 @@ func (s *Storage) Data() string {
 }
 
 // Write writes migration history data to storage.
-func (s *Storage) Write(ctx context.Context, b []byte) error {
+func (s *Storage) Write(_ context.Context, b []byte) error {
 	if s.config.WriteError {
 		return fmt.Errorf("failed to write mock storage: writeError = %t", s.config.WriteError)
 	}
@@ -42,7 +42,7 @@ func (s *Storage) Write(ctx context.Context, b []byte) error {
 }
 
 // Read reads migration history data from storage.
-func (s *Storage) Read(ctx context.Context) ([]byte, error) {
+func (s *Storage) Read(_ context.Context) ([]byte, error) {
 	if s.config.ReadError {
 		return nil, fmt.Errorf("failed to read mock storage: readError = %t", s.config.ReadError)
 	}
diff --git a/storage/s3/storage_test.go b/storage/s3/storage_test.go
index b6d3335..ea11d74 100644
--- a/storage/s3/storage_test.go
+++ b/storage/s3/storage_test.go
@@ -20,12 +20,12 @@ type mockClient struct {
 }
 
 // PutObjectWithContext returns a mocked response.
-func (c *mockClient) PutObjectWithContext(ctx aws.Context, input *s3.PutObjectInput, opts ...request.Option) (*s3.PutObjectOutput, error) {
+func (c *mockClient) PutObjectWithContext(_ aws.Context, _ *s3.PutObjectInput, _ ...request.Option) (*s3.PutObjectOutput, error) {
 	return c.putOutput, c.err
 }
 
 // GetObjectWithContext returns a mocked response.
-func (c *mockClient) GetObjectWithContext(ctx aws.Context, input *s3.GetObjectInput, opts ...request.Option) (*s3.GetObjectOutput, error) {
+func (c *mockClient) GetObjectWithContext(_ aws.Context, _ *s3.GetObjectInput, _ ...request.Option) (*s3.GetObjectOutput, error) {
 	return c.getOutput, c.err
 }
 
diff --git a/tfexec/executor_test.go b/tfexec/executor_test.go
index 8f8f0b9..e76c730 100644
--- a/tfexec/executor_test.go
+++ b/tfexec/executor_test.go
@@ -16,7 +16,7 @@ func mockEcho(args ...string) int {
 	return 0
 }
 
-func mockFalse(args ...string) int {
+func mockFalse(_ ...string) int {
 	return 1
 }
 
diff --git a/tfexec/test_helper.go b/tfexec/test_helper.go
index fa32695..3c0b304 100644
--- a/tfexec/test_helper.go
+++ b/tfexec/test_helper.go
@@ -34,7 +34,7 @@ func NewMockExecutor(mockCommands []*mockCommand) Executor {
 }
 
 // NewCommandContext builds and returns an instance of Command.
-func (e *mockExecutor) NewCommandContext(ctx context.Context, name string, args ...string) (Command, error) {
+func (e *mockExecutor) NewCommandContext(_ context.Context, name string, args ...string) (Command, error) {
 	cmd := e.mockCommands[e.newCommnadContextCalls]
 	e.newCommnadContextCalls++
 	// store called args to pass runFunc callback.
@@ -70,7 +70,7 @@ func (e *mockExecutor) Dir() string {
 }
 
 // AppendEnv appends an environment variable.
-func (e *mockExecutor) AppendEnv(key string, value string) {
+func (e *mockExecutor) AppendEnv(_ string, _ string) {
 	// no op.
 }
 
diff --git a/tfmigrate/mock_migrator.go b/tfmigrate/mock_migrator.go
index 022ecd0..dc01fe0 100644
--- a/tfmigrate/mock_migrator.go
+++ b/tfmigrate/mock_migrator.go
@@ -20,7 +20,7 @@ type MockMigratorConfig struct {
 var _ MigratorConfig = (*MockMigratorConfig)(nil)
 
 // NewMigrator returns a new instance of MockMigrator.
-func (c *MockMigratorConfig) NewMigrator(o *MigratorOption) (Migrator, error) {
+func (c *MockMigratorConfig) NewMigrator(_ *MigratorOption) (Migrator, error) {
 	return NewMockMigrator(c.PlanError, c.ApplyError), nil
 }
 
@@ -45,7 +45,7 @@ func NewMockMigrator(planError bool, applyError bool) *MockMigrator {
 
 // plan computes a new state by applying state migration operations to a temporary state.
 // It does nothing, but can return an error.
-func (m *MockMigrator) plan(ctx context.Context) (*tfexec.State, error) {
+func (m *MockMigrator) plan(_ context.Context) (*tfexec.State, error) {
 	if m.planError {
 		return nil, fmt.Errorf("failed to plan mock migrator: planError = %t", m.planError)
 	}