diff --git a/app/di/wire_gen.go b/app/di/wire_gen.go
index 36cf759..bf0433e 100644
--- a/app/di/wire_gen.go
+++ b/app/di/wire_gen.go
@@ -22,10 +22,7 @@ func NewS3App(ctx context.Context, profile model.AWSProfile, region model.Region
 	if err != nil {
 		return nil, err
 	}
-	client, err := external.NewS3Client(awsConfig)
-	if err != nil {
-		return nil, err
-	}
+	client := external.NewS3Client(awsConfig)
 	s3BucketCreator := external.NewS3BucketCreator(client)
 	interactorS3BucketCreator := interactor.NewS3BucketCreator(s3BucketCreator)
 	s3BucketLister := external.NewS3BucketLister(client)
@@ -53,10 +50,7 @@ func NewSpareApp(ctx context.Context, profile model.AWSProfile, region model.Reg
 	if err != nil {
 		return nil, err
 	}
-	client, err := external.NewCloudFrontClient(awsConfig)
-	if err != nil {
-		return nil, err
-	}
+	client := external.NewCloudFrontClient(awsConfig)
 	cloudFrontCreator := external.NewCloudFrontCreator(client)
 	cloudFrontOAICreator := external.NewCloudFrontOAICreator(client)
 	cloudFrontCreatorOptions := &interactor.CloudFrontCreatorOptions{
@@ -64,10 +58,7 @@ func NewSpareApp(ctx context.Context, profile model.AWSProfile, region model.Reg
 		OAICreator:        cloudFrontOAICreator,
 	}
 	interactorCloudFrontCreator := interactor.NewCloudFrontCreator(cloudFrontCreatorOptions)
-	s3Client, err := external.NewS3Client(awsConfig)
-	if err != nil {
-		return nil, err
-	}
+	s3Client := external.NewS3Client(awsConfig)
 	s3ObjectUploader := external.NewS3ObjectUploader(s3Client)
 	fileUploader := interactor.NewFileUploader(s3ObjectUploader)
 	s3BucketCreator := external.NewS3BucketCreator(s3Client)
diff --git a/app/external/cloudfront.go b/app/external/cloudfront.go
index c77a83a..4c9b931 100644
--- a/app/external/cloudfront.go
+++ b/app/external/cloudfront.go
@@ -15,8 +15,8 @@ import (
 )
 
 // NewCloudFrontClient returns a new CloudFront client.
-func NewCloudFrontClient(cfg *model.AWSConfig) (*cloudfront.Client, error) {
-	return cloudfront.NewFromConfig(*cfg.Config), nil
+func NewCloudFrontClient(cfg *model.AWSConfig) *cloudfront.Client {
+	return cloudfront.NewFromConfig(*cfg.Config)
 }
 
 // CloudFrontCreatorSet is a provider set for CloudFrontCreator.
diff --git a/app/external/s3.go b/app/external/s3.go
index 205b867..45940fd 100644
--- a/app/external/s3.go
+++ b/app/external/s3.go
@@ -19,8 +19,8 @@ import (
 
 // NewS3Client creates a new S3 service client.
 // If profile is empty, the default profile is used.
-func NewS3Client(cfg *model.AWSConfig) (*s3.Client, error) {
-	return s3.NewFromConfig(*cfg.Config), nil
+func NewS3Client(cfg *model.AWSConfig) *s3.Client {
+	return s3.NewFromConfig(*cfg.Config)
 }
 
 // S3BucketCreator implements the S3BucketCreator interface.
diff --git a/app/external/s3_helper_test.go b/app/external/s3_helper_test.go
index 01524fd..6dab305 100644
--- a/app/external/s3_helper_test.go
+++ b/app/external/s3_helper_test.go
@@ -17,11 +17,7 @@ func S3Client(t *testing.T) *s3.Client {
 	if err != nil {
 		t.Fatal(err)
 	}
-	client, err := NewS3Client(config)
-	if err != nil {
-		t.Fatal(err)
-	}
-	return client
+	return NewS3Client(config)
 }
 
 // CreateS3Buckets creates S3 buckets. Region is fixed to ap-northeast-1.
diff --git a/app/external/s3_test.go b/app/external/s3_test.go
index 8a8308e..4392a3e 100644
--- a/app/external/s3_test.go
+++ b/app/external/s3_test.go
@@ -21,10 +21,7 @@ func TestS3BucketCreator_CreateS3Bucket(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		client, err := NewS3Client(config)
-		if err != nil {
-			t.Fatal(err)
-		}
+		client := NewS3Client(config)
 
 		s3BucketCreator := NewS3BucketCreator(client)
 		input := &service.S3BucketCreatorInput{
@@ -47,10 +44,7 @@ func TestS3BucketCreator_CreateS3Bucket(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		client, err := NewS3Client(config)
-		if err != nil {
-			t.Fatal(err)
-		}
+		client := NewS3Client(config)
 
 		s3BucketCreator := NewS3BucketCreator(client)
 		input := &service.S3BucketCreatorInput{
@@ -74,10 +68,7 @@ func TestS3BucketCreator_CreateS3Bucket(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		client, err := NewS3Client(config)
-		if err != nil {
-			t.Fatal(err)
-		}
+		client := NewS3Client(config)
 
 		s3BucketCreator := NewS3BucketCreator(client)
 		input := &service.S3BucketCreatorInput{
@@ -97,10 +88,7 @@ func TestS3BucketCreator_CreateS3Bucket(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		client, err := NewS3Client(config)
-		if err != nil {
-			t.Fatal(err)
-		}
+		client := NewS3Client(config)
 
 		s3BucketCreator := NewS3BucketCreator(client)
 		input := &service.S3BucketCreatorInput{
@@ -120,10 +108,7 @@ func TestS3BucketCreator_CreateS3Bucket(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		client, err := NewS3Client(config)
-		if err != nil {
-			t.Fatal(err)
-		}
+		client := NewS3Client(config)
 
 		s3BucketCreator := NewS3BucketCreator(client)
 		input := &service.S3BucketCreatorInput{
@@ -147,10 +132,7 @@ func TestS3BucketLister_ListS3Buckets(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		client, err := NewS3Client(config)
-		if err != nil {
-			t.Fatal(err)
-		}
+		client := NewS3Client(config)
 
 		CreateS3Buckets(t, client, []model.Bucket{
 			model.Bucket("test-bucket-3"),
@@ -191,10 +173,7 @@ func TestS3BucketLister_ListS3Buckets(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		client, err := NewS3Client(config)
-		if err != nil {
-			t.Fatal(err)
-		}
+		client := NewS3Client(config)
 
 		s3BucketLister := NewS3BucketLister(client)
 		got, err := s3BucketLister.ListS3Buckets(context.Background(), &service.S3BucketListerInput{})
@@ -220,10 +199,7 @@ func TestS3BucketLocationGetter_GetS3BucketLocation(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		client, err := NewS3Client(config)
-		if err != nil {
-			t.Fatal(err)
-		}
+		client := NewS3Client(config)
 
 		CreateS3Buckets(t, client, []model.Bucket{
 			model.Bucket("test-bucket-1"),
@@ -253,10 +229,7 @@ func TestS3BucketLocationGetter_GetS3BucketLocation(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		client, err := NewS3Client(config)
-		if err != nil {
-			t.Fatal(err)
-		}
+		client := NewS3Client(config)
 
 		s3BucketLocationGetter := NewS3BucketLocationGetter(client)
 		_, got := s3BucketLocationGetter.GetS3BucketLocation(context.Background(), &service.S3BucketLocationGetterInput{
@@ -274,10 +247,7 @@ func TestS3BucketLocationGetter_GetS3BucketLocation(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		client, err := NewS3Client(config)
-		if err != nil {
-			t.Fatal(err)
-		}
+		client := NewS3Client(config)
 
 		s3BucketCreator := NewS3BucketCreator(client)
 		input := &service.S3BucketCreatorInput{
@@ -327,10 +297,8 @@ func TestS3BucketDeleter_DeleteS3Bucket(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		client, err := NewS3Client(config)
-		if err != nil {
-			t.Fatal(err)
-		}
+		client := NewS3Client(config)
+
 		s3BucketCreator := NewS3BucketCreator(client)
 		input := &service.S3BucketCreatorInput{
 			Bucket: model.Bucket("test-bucket"),
diff --git a/go.mod b/go.mod
index ee7f2ff..2e6aec7 100644
--- a/go.mod
+++ b/go.mod
@@ -8,6 +8,7 @@ require (
 	github.com/AlecAivazis/survey/v2 v2.3.7
 	github.com/aws/aws-sdk-go-v2 v1.24.1
 	github.com/aws/aws-sdk-go-v2/config v1.26.3
+	github.com/aws/aws-sdk-go-v2/service/cloudformation v1.42.6
 	github.com/aws/aws-sdk-go-v2/service/cloudfront v1.32.6
 	github.com/aws/aws-sdk-go-v2/service/s3 v1.48.0
 	github.com/charmbracelet/bubbles v0.17.1
diff --git a/go.sum b/go.sum
index c853e3c..8a938e8 100644
--- a/go.sum
+++ b/go.sum
@@ -22,6 +22,8 @@ github.com/aws/aws-sdk-go-v2/internal/ini v1.7.2 h1:GrSw8s0Gs/5zZ0SX+gX4zQjRnRsM
 github.com/aws/aws-sdk-go-v2/internal/ini v1.7.2/go.mod h1:6fQQgfuGmw8Al/3M2IgIllycxV7ZW7WCdVSqfBeUiCY=
 github.com/aws/aws-sdk-go-v2/internal/v4a v1.2.10 h1:5oE2WzJE56/mVveuDZPJESKlg/00AaS2pY2QZcnxg4M=
 github.com/aws/aws-sdk-go-v2/internal/v4a v1.2.10/go.mod h1:FHbKWQtRBYUz4vO5WBWjzMD2by126ny5y/1EoaWoLfI=
+github.com/aws/aws-sdk-go-v2/service/cloudformation v1.42.6 h1:XdEBz/eAB4K5QyQ9fx3sgbthOW3WiNOSomnhFXk6R+g=
+github.com/aws/aws-sdk-go-v2/service/cloudformation v1.42.6/go.mod h1:3+AceTAg/X5AUM/SkAbgxzviOBmsGaf9POso/Ymz5vc=
 github.com/aws/aws-sdk-go-v2/service/cloudfront v1.32.6 h1:xKbFXea2CIF/Wskauz1TMr//wZ6FyzEafMdSBIQqn80=
 github.com/aws/aws-sdk-go-v2/service/cloudfront v1.32.6/go.mod h1:iB6PQSb3ULRrrlEiuFfVE318JiBOdk4k46BbuzrrgXc=
 github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.10.4 h1:/b31bi3YVNlkzkBrm9LfpaKoaYZUxIAj4sHfOTmLfqw=