The submitted article concerns the issue of the treaty capacity of the dependent states, which was considered in the course of the work of the UN International Law Commission (UNCCP) on the draft convention on the law of treaties. And although today this term does not apply to the international community consisting of sovereign states, at the time when the preparatory work of the UN KPM was underway, which began in 1949 and continued for the next seventeen years, the concept of dependent states was widely used. Well, at least that was the beginning of this process. This article presents the changes to the regulation on the treaty capacity of the dependent states contained in the drafts prepared by the four successive rapporteurs of the Commission who were entrusted with the task of drafting a convention on the law of treaties. This issue was important because sometimes the dependent states had the ability to conclude treaties independently, regardless of the treaty capacity of the state responsible for conducting their foreign affairs. The discussed issue seems to be of particular interest in comparison with the process of decolonization at that time, supported, inter alia, by the declaration of the United Nations General Assembly of 1960 on granting independence to colonial states and nations (Resolution 1514). Since then, the coexistence of equal and sovereign states (including those emerged as a result of decolonization) has been the basis for maintaining international peace and security under the supervision of the UN Security Council. The notion of a "dependent state" therefore had to be finally rejected in the ILC's draft work. The Commission recognized that states must be sovereign and, as such, have treaty capacity. This solution was then upheld in the laconic disposition of Art. 6 of the Vienna Convention on the Law of Treaties of 1969 (KPT), according to which each state has the capacity to conclude treaties. According to the KPT, the term "state" within the meaning of this convention has the same meaning as, inter alia, in the Charter of the United Nations, i.e. as a state in the meaning of international law, or as a state in the international meaning of the term.