Oil prices hit their highest level in nearly a year on Friday, gaining 8% on the week, supported by Saudi Arabia’s pledge to cut output and strong gains in major equity markets.

Brent crude settled at $55.99 a barrel, climbing $1.61, or 3%, on the day and 8.1% on the week. West Texas Intermediate crude futures (WTI) closed at $52.24 a barrel, gaining $1.41, or 2.8%, also its highest since late February. WTI posted a weekly gain of 7.7%.

Saudi Arabia this week pledged extra, voluntary oil output cuts of 1 million barrels per day (bpd) in February and March as part of a deal under which most OPEC+ producers will hold production steady during new lockdowns.

The kingdom, the de facto leader of the Organization of the Petroleum Exporting Countries, was at odds with some other producers that wanted to boost output to head off U.S. shale companies from capturing more market share. Eventually, an agreement was reached to allow Russia and others to boost output while the Saudis restrict theirs.