How to change password version by myself in oracle? Oracle documentation (18c) says:

....
You must expire the users who have only the 10G password version, and
do not have one or both of the 11G or 12C password versions.
For example:
ALTER USER username PASSWORD EXPIRE;
Ask the users whose passwords you expired to log in. When the users
log in, they are prompted to change their passwords. The database
generates the missing 11G and 12C password versions for their account,
in addition to the 10G password version. The 10G password version
continues to be present, because the database is running in the
permissive mode.
...

But, there is some way to do it by myself? (and to use the same old password)
If you have the proper permissions, you can change anyone's password. Of course, if you want to keep the password the same, just &quot;changing&quot; it so that it gets upgraded to new standards, you will need to know the current value.
And you don't have to expire it first. Expiring the password simply forces the user to set a &quot;new&quot; password the next time they log in. And even that depends on what client they are using. Some do not trap and handle expired passwords, and simply fail the logon.
Exactly which oracle doc were you quoting? (Never quote a source without full citation.)