how to change a certain line in a file, using SED ?

I have a test file that is about 5000 lines long. There are about 30
different lines in this file where each line looks exactly like this:

CODE = 1234


I would like to use a UNIX command (maybe something like sed) to
replace that line mentioned above, that is found on exactly line
number 575 of that file, to something like this:

CODE = 5678


Keep in mind. I don't want to change ALL of the lines with the string
"CODE = 1234" to "CODE = 5678". I just want to do this on line 575 of
that file.

Does anyone know how I can do this in UNIX shell? Thanks.

.

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