diff --git a/client/auth.go b/client/auth.go
index 200009609..a491dd82f 100644
--- a/client/auth.go
+++ b/client/auth.go
@@ -275,7 +275,7 @@ func (c *Conn) writeAuthHandshake() error {
 	data[11] = 0x00
 
 	// Charset [1 byte]
-	// use default collation id 33 here, is `utf8mb3_general_ci`
+	// use default collation id 255 here, is `utf8mb4_0900_ai_ci`
 	collationName := c.collation
 	if len(collationName) == 0 {
 		collationName = DEFAULT_COLLATION_NAME
diff --git a/mysql/const.go b/mysql/const.go
index 09c62cc3d..293382a38 100644
--- a/mysql/const.go
+++ b/mysql/const.go
@@ -183,10 +183,10 @@ const (
 	DEFAULT_IPV6_ADDR             = "[::1]:3306"
 	DEFAULT_USER                  = "root"
 	DEFAULT_PASSWORD              = ""
-	DEFAULT_FLAVOR                = "mysql"
-	DEFAULT_CHARSET               = "utf8"
-	DEFAULT_COLLATION_ID   uint8  = 33
-	DEFAULT_COLLATION_NAME string = "utf8_general_ci"
+	DEFAULT_FLAVOR                = MySQLFlavor
+	DEFAULT_CHARSET               = "utf8mb4"
+	DEFAULT_COLLATION_ID   uint8  = 255
+	DEFAULT_COLLATION_NAME string = "utf8mb4_0900_ai_ci"
 )
 
 const (