In July 2019, Mizuho completed the move to MINORI, a new core banking system developed after a major system failure in 2011. Between February 28 and March 12, 2021, Mizuho Bank had four system failures.
In June 2021, the bank published the report of its investigation. Among the causes, the report named a lack of training for system failures. It also found causes in common with the failures of 2002 and 2011.