Japan's health ministry has reached an agreement with US pharmaceutical firm Pfizer for additional coronavirus vaccine supplies.
Officials announced on Friday that the ministry signed a formal contract to receive 120 million additional doses from January.
They plan to start providing booster shots from December due to reports in Japan and overseas that the vaccine's efficacy wanes over time.
The ministry had agreed to receive 50 million more doses from Moderna, and 150 million doses from Novavax, both US firms, next year.
The government says 63.1 percent of the Japanese public has received two doses of a coronavirus vaccine.