C:UsersBKBlog> php artisan migrate

In Connection.php line 664:
SQLSTATE[HY000]: General error: 1273 Unknown collation: 'utf8mb4'
(SQL: select * from information_schema.tables where
table_schema = mydb    and table_name = migrations)

In MySqlConnector.php line 56:

SQLSTATE[HY000]: General error: 1273 Unknown collation: 'utf8mb4'

DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=mydb
DB_USERNAME=root
DB_PASSWORD=