The Senedd, which is housed in Cardiff Bay, presently has 60 members; however, under the recently approved government plans, that number will increase to 96.
It was 25 years ago this week that the Welsh Assembly, as it was then called, held its inaugural election.
The Senedd Amendment For Bill to be approved, a supermajority of the Senedd, or two-thirds of members, was required.
On Wednesday night, forty-three members voted in favor of the bill and sixteen against.
To ensure they had the votes to pass legislation, the Labour administration and Plaid Cymru signed a cooperation agreement.
