Reform of the United Nations Security Council
Since its creation in 1945, the United Nations Security Council (UNSC) has undergone one reform in 1965, increasing the amount of non-permanent members from 6 to 10, but there have since been many calls for reform; Some key issues raised are the categories of membership, the question of the veto held by the five permanent members, regional representation, the size of an enlarged Council and its working methods, and the Security Council–General Assembly relationship. Any reform of the Security Council would require the agreement of two-thirds of all United Nations member states and ratification by two-thirds of Member States.
Source: Wikipedia — Reform of the United Nations Security Council (CC BY-SA 4.0)