On February 26, 2018, the UN Working Group on Arbitrary Detention released its Revised Deliberation No. 5 on Deprivation of Liberty of Migrants, in which the Group discusses its “criteria for determining whether the deprivation of liberty of asylum seekers and immigrants might be arbitrary.” It provides a series of explanations regarding the various rights of migrants under international law as they concern the deprivation of liberty on matters such as the length of detention, the right to asylum, challenging detention, rights during detention, and the prohibition of non-refoulement. As noted in the press release, the Deliberation states that “[p]lacing migrants and asylum seekers in detention should be seen as a last resort to be used only in strictly limited circumstances,” while also reaffirming generally “the absolute prohibition of arbitrary detention and the universal human right to seek asylum.” This Deliberation updates a previous one on the subject from 1999 in order to reflect changes in international law and the Working Group’s jurisprudence since then.