WordPress pushed out Version 4.9.3 Maintenance Release with 34 bug fixes earlier this week. The update introduced an updating bug: after auto-updating to 4.3, WordPress will no longer update automatically. The good news is that 49.4 is already out, published as an emergency fix just one day later. But the bad news is youll have to update by hand and wait for 4.4 to get the fix. WordPress has published an explanation of the bug and detailed instructions for handraulic updating.”]
Source: https://nakedsecurity.sophos.com/2018/02/08/wordpress-users-do-an-update-now-and-do-it-by-hand/