Abstract: The present invention relates to antibodies and antigen binding fragments thereof, which bind to a complex of GARP and TGF-?1, particularly a complex of human GARP and human TGF-?1. These antibodies and antigen binding fragments exhibit a combination of advantageous properties including high affinity antigen binding and the ability to inhibit the release of active TGF-? from regulatory T cells. The antibodies and antigen binding fragments of the present invention are relatively resistant to deamidation, isomerization and oxidation, such that they display improved stability.