Can I change the output voltage

I am using NI Elvis board.
I measured the digital output voltage and it was approximately 2.3 volt.
can I increase the output voltage to ,for example, 5 volt.

GDE [DE]
thank you for your replay.
I mentioned this problem to one of my instructors. he told that the needed current to operate the relays is larger than the borad can supply. therefore, the output voltage droped from 5 volt to 2.3 volt.
he suggested a buffer and the relays worked.

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