Permafrost changes mainly refer to changes in temperature and active layer thickness  . Permafrost temperature near the depth of zero annual temperature amplitude increased globally by 0.29+0.12℃ during 2007-2016, by 0.39+0.15°C in the continuous permafrost and by 0.20+0.10℃ in the discontinuous permafrost . Thus, permafrost has been warming during the last 3-4 decades  with a rate of 0.4ºC-1.4℃ per decade throughout the Russian Arctic, 0.1ºC-0.8℃ per decade in Alaska and Arctic Canada during 2007-2016  and 0.1°C-0.24℃ per decade in the Tibetan plateau . The ALT has also been increasing in the European and Russian Arctic and high-mountain areas of Eurasia since the mid-1990s . Unfortunately, unlike glaciers and snow, the lack of in situ observations on permafrost still cannot be compensated for by remote sensing. Still, some methodological progress on this front has been happening recently .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report