For the thirteenth time, the Canada-U.S. border reopening has been pushed back by another month.

On April 20 — one day before the last extension was set to end — Minister of Public Safety Bill Blair confirmed that the border would remain closed to discretionary travel until at least May 21, 2021.

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Blair said that decisions would continue to be made based on “the best public health advice available.”

Borders between the two countries have remained closed to non-essential travel for over a year, with restrictions first going into effect back in March 2020.

It comes as Canada continues to deal with a “very serious” third wave of COVID-19. Earlier this month, Canada’s average daily confirmed cases (per million people) topped that of the United States for the first time since the beginning of the pandemic.