Thanks for your question. Here's the relevant section from the Official Rules:
"(i) Once a Submission has been submitted, Contestant may not make any changes or alterations to the Submission until after the Judging Period has ended. Applications can not be changed after the Competition Submission Period and before the end of the Judging Period, unless the Contestant has provided an installation file and testing instructions on the Enter an Application form on the Competition Websites. Web or mobile web Applications must not be updated after the Competition Submission Period and before the end of the Judging Period. Doing so may cause the Contestant's Submission to be disqualified."