diff --git a/go.mod b/go.mod
index 066269d..3ccc0dd 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module OwOrganizer
 
-go 1.25.0
+go 1.27.0
 
 require (
 	github.com/go-sql-driver/mysql v1.10.0
diff --git a/main.go b/main.go
index 01eaafb..38b7890 100644
--- a/main.go
+++ b/main.go
@@ -20,13 +20,9 @@ var (
 
 	datastore PasskeyStore
 	//sessions  SessionStore
-	l Logger
+	l = log.Default()
 )
 
-type Logger interface {
-	Printf(format string, v ...interface{})
-}
-
 type PasskeyUser interface {
 	webauthn.User
 	AddCredential(*webauthn.Credential)
@@ -43,10 +39,7 @@ type PasskeyStore interface {
 }
 
 func main() {
-	l = log.Default()
-
 	godotenv.Load()
-
 	proto := getEnv("PROTO", "http")
 	host := getEnv("HOST", "localhost")
 	port := ":" + getEnv("PORT", "8080")
@@ -60,35 +53,33 @@ func main() {
 
 	l.Printf("[INFO] make webauthn config")
 	wconfig := &webauthn.Config{
-		RPDisplayName: "Go Webauthn",    // Display Name for your site
+		RPDisplayName: "OwOrganizer",    // Display Name for your site
 		RPID:          host,             // Generally the FQDN for your site
 		RPOrigins:     []string{origin}, // The origin URLs allowed for WebAuthn
 	}
 
 	l.Printf("[INFO] create webauthn")
 	if webAuthn, err = webauthn.New(wconfig); err != nil {
-		fmt.Printf("[FATAL] %s", err.Error())
+		l.Panicf(err.Error())
 		os.Exit(1)
 	}
 
 	db, err := sql.Open("mysql", cfg.FormatDSN())
 	if err != nil {
-		panic(err)
+		l.Panicf(err.Error())
 	}
 	defer db.Close()
-	// See "Important settings" section.
 	db.SetConnMaxLifetime(time.Minute * 3)
 	db.SetMaxOpenConns(10)
 	db.SetMaxIdleConns(10)
 	_, err = db.Exec(fmt.Sprintf("CREATE DATABASE IF NOT EXISTS %s", dbName))
 	if err != nil {
-		log.Fatalf("Failed to verify/create database: %v", err)
+		log.Panicf("Failed to verify/create database: %v", err)
 	}
 
-	// 3. Switch your current connection pool to the database
 	_, err = db.Exec(fmt.Sprintf("USE %s", dbName))
 	if err != nil {
-		log.Fatalf("Failed to switch database: %v", err)
+		log.Panicf("Failed to switch database: %v", err)
 	}
 
 	query := "CREATE TABLE IF NOT EXISTS users (" +
@@ -106,7 +97,7 @@ func main() {
 
 	_, err = db.Exec(query)
 	if err != nil {
-		log.Fatalf("Failed to verify/create table: %v", err)
+		log.Panicf("Failed to verify/create table: %v", err)
 	}
 
 	l.Printf("[INFO] create datastore")
diff --git a/store.go b/store.go
index 6b1be42..287d8a9 100644
--- a/store.go
+++ b/store.go
@@ -5,6 +5,7 @@ import (
 	"database/sql"
 	"encoding/base64"
 	"fmt"
+	"log"
 	_ "github.com/go-sql-driver/mysql"
 	"github.com/go-webauthn/webauthn/webauthn"
 )
@@ -15,7 +16,7 @@ type InMem struct {
 	users    map[string]PasskeyUser
 	sessions map[string]webauthn.SessionData
 
-	log Logger
+	log* log.Logger
 	db*  sql.DB
 }
 
@@ -30,7 +31,7 @@ func (i *InMem) GenSessionID() (string, error) {
 
 }
 
-func NewInMem(log Logger, db *sql.DB) *InMem {
+func NewInMem(log *log.Logger, db *sql.DB) *InMem {
 	return &InMem{
 		users:    make(map[string]PasskeyUser),
 		sessions: make(map[string]webauthn.SessionData),