UPDATE mysql.user SET authentication_string = PASSWORD('NEW_USER_PASSWORD') code example

Example 1: change mysql password from command line

ALTER USER 'root'@'localhost' IDENTIFIED BY 'New-Password';

Example 2: mysql set password for user

# `SET PASSWORD FOR <user> = PASSWORD('<plaintext_password>')` is deprecated
SET PASSWORD FOR <user> = '<plaintext_password>';
FLUSH PRIVILEGES;