About MySQL password modification failure

Invalid modification statement （ Version of the problem ）

update mysql.user set authentication_string=password('123456') where user='root'

Note that the above statement has been invalidated , The new version is ：

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';

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Actually, I wonder , When I finished writing the design half a year ago, I used the earlier command , yes modify user Tabular .
Three months ago docker Deploy MySQL The master and slave use the above command .
Today's order will not work , We will use the following command .
Is it changing so fast ？ Do you need to change a few commands to update the version ？
notes ： I learned it for the first time two and a half years ago MySQL It's used MySQL8, I was thinking that it was a big version. What's wrong with it ？

Come to the conclusion ： Use the old version properly .