The UK will pay France £8m more a year under a revised deal to try to stop people crossing the English Channel in small boats, reports the BBC.
Under the updated agreement, UK police officers will be embedded with their French counterparts in control rooms and on beaches.
The number of officers patrolling the French coast to try to stop people setting off will rise from 200 to 300.
PM Rishi Sunak said he was "confident we can bring the numbers down".
But, speaking to reporters whilst travelling to the G20 summit in Bali, he warned there was no "single thing" that could be done to "fix" the situation.
The government is under increasing pressure over Channel crossings, with the number of people making the journey rising to record levels.
Under the new agreement, signed by Home Secretary Suella Braverman during a trip to Paris, the amount the UK pays France to cover the cost of increased patrols will increase from £55m last year to £63m this year.