Greg has released three stable kernel updates: 18.104.22.168, 22.214.171.124 and 126.96.36.199. There aren't many changes to 188.8.131.52. That series will not be supported much longer. Both 184.108.40.206 and 220.127.116.11 have a fix for a really nasty sigreturn bug on ARM systems, among other changes. Users of these kernel series must upgrade.