Verb meaning "to robust"

I am looking for a verb meaning "to make something more robust", especially in a software engineering context.

Is "to robust" correct and understandable? "Robustify" seems to be another candidate but does not seem so common.

Solution 1:

Neither robustify nor 'to robust' are correct.

You can use 'to make robust' or any of the options Bob noted.

I would use "strengthen", "fortify", or "harden", although "harden" has a distinct security meaning.