An IL-1β binding antibody or IL-1β binding fragment thereof comprising the amino acid sequence of SEQ ID NO: 2, and related nucleic acids, vectors, cells, and compositions, as well as method of using same to treat or prevent a disease, and a method of preparing an affinity matured IL-1β binding polypeptide. IL-1β binding antibodies or IL-1β binding fragments thereof are provided which have desirable affinity and potency.