Vietcombank sold the dollar at VND24,730, down 0.12% from Thursday.
The State Bank of Vietnam raised its reference up 0.03% to VND24,095.
The dollar was stable at VND24,600 on the black market.
It has increased against the dong by 4.21% since the beginning of the year.
The dollar was headed for a weekly gain on Friday, aided by solid U.S. growth figures that bolstered the case for higher-for-longer interest rates, while the yen hovered on the weaker side of 150 per dollar ahead of a key policy meeting next week, Reuters reported.
The U.S. dollar index steadied at 106.57, having hit a three-week high of 106.89 in the previous session, and was on track for a weekly gain of about 0.4%.
Sterling edged 0.07% higher to $1.21355, though was not too far from a three-week low of $1.2070 hit on Thursday.
The euro slipped 0.02% to $1.0560 and was headed for a weekly loss of roughly 0.3%.