Vietcombank sold the dollar at VND25,461, up 0.02% from Thursday.
The greenback is sold at VND25,810 on the black market, up 0.1%.
The State Bank of Vietnam (SBV) maintained its reference rate is at VND24,250.
The dollar has strengthened against the dong by 4.26% since the beginning of the year.
Globally, the dollar gained on Thursday despite a soft U.S. producer price inflation report for May, after the Federal Reserve adopted a hawkish tone at the conclusion of its meeting on Wednesday, Reuters reported.
The dollar index was last up 0.49% at 105.20. It reached a four-week high of 105.46 on Tuesday, before dropping as much as 1% after Wednesday's CPI data.
The dollar is likely to remain supported as Fed policy contrasts with more dovish international central banks.
The euro was last down 0.65% at $1.0739. It fell as low as $1.07195 on Tuesday, the lowest since May 2, before jumping as high as $1.08523 on Wednesday as the dollar weakened.
The dollar was last up 0.11% at 156.89 yen.