Minister for Disabled People, Esther McVey, has told Daybreak that the changes will focus benefits on those who need them most.
She said: "Disability Living Allowance (DLA) came out in the 1990s and it was very much about physical disabilities.
"Now we're adjusting it to take into account disability how we understand it today - mental disabilities as well as fluctuating ones.
"So it is actually understanding disabilities more and it is really focusing benefits to where it's needed most."
More top news
Today there'll be plenty of sunshine across the British Isles with wispy cloud towards the coast.
A Star Wars-themed fleet of planes is set to take to the skies after Japan's Ana Airways announced a partnership with Lucasfilm.
A gorilla almost smashed through a glass enclosure when he saw a little girl beat her chest.