The present disclosure relates to methods for treating bronchiectasis, for example, non-cystic fibrosis bronchiectasis with compositions comprising an effective amount of certain (2S)—N-[(1S)-1-cyano-2-phenylethyl]-1,4-oxazepane-2-carboxamide compounds of Formula (I), including pharmaceutically acceptable salts thereof,; ;that inhibit dipeptidyl peptidase 1 (DPP1) activity. Methods provided herein are useful for prophylaxis, increasing the lung function in a patient, and/or and/or decreasing the rate of pulmonary exacerbation in a patient. In one embodiment, the compound of Formula (I) is (2S)—N-{(1S)-1-cyano-2-[4-(3-methyl-2-oxo-2,3-dihydro-1,3-benzoxazol-5-yl)phenyl]ethyl}-1,4-oxazepane-2-carboxamide.
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