Magistrates will now handle serious Victorian bail matters after the man accused of the Bourke St tragedy was bailed just five days before the attack.
Volunteer bail justices will no longer be used for serious matters in out-of-hours decisions, with extra magistrates now on-call.
Victorian Premier Daniel Andrews also says "nothing will be off limits" in a review of the state's bail system.
"Each of the families and those victims are owed nothing less than the hard work required and our singular focus to make the change necessary to make Victoria safer," he told reporters on Monday.
He said "no expense will be spared to get this right", and extra magistrates and resources would be engaged.
The man accused of killing five people in Bourke St on Friday, was bailed against the wishes of Victoria Police five days before Friday's attack.
Former Director of Public Prosecutions Paul Coghlan will review the entire bail system.
"Nothing will be off the table. Nothing will be off limits," Mr Andrews said.
Mr Coghlan has a deadline of April 3 to provide the government with urgent advice on changes to the bail system.
Attorney-General Martin Pakula said Mr Coghlan's review would look at the balance between community protection and the presumption of innocence.
"We want him to look at the current exceptional circumstances, show cause and unacceptable risk provisions and provide us with advice on whether they appropriate in the current circumstances," Mr Pakula told reporters.
Chief Magistrate Peter Lauritesen has been working with the government to make the changes.
"He recognises the need for change in this area," Mr Pakula said.
Mr Andrews said it was expected two to three additional magistrates would be made available "within days" while the establishment of the night court would take "a little longer".
Police Association of Victoria boss Ron Iddles supported the changes.
"The environment has changed where we need 24/7 magistrates available to hear these sorts of applications," Mr Iddles told ABC 774.
Victims of Crime Commissioner Greg Davies said people shouldn't blame police when the man should have been behind bars.
"Not one aspect of it would have taken place if he had been remanded in custody," Mr Davies told ABC 774.
Opposition Leader Matthew Guy says a major overhaul of the state's bail system is needed urgently, going beyond the premier's plans.
He proposes three changes - the presumption of remand for those charged with violent crimes, a "one strike and you're out" rule for those who break bail, and a reversal of changes to bail for juvenile offenders introduced last year.
"More people will need to be remanded, yes, but what price do we put on community safety?" he told reporters on Monday.
He says the 1000 beds to come online at the completion of Ravenhall Prison means the state will have capacity to cope with more offenders on remand.
