Unofficial exchange points sold the greenback 0.48% higher at VND25,350.
Vietcombank kept its rate unchanged at VND25,030.
The State Bank of Vietnam’s reference rate was stable at VND24,224.
The dollar has risen 2.41% against the dong since the beginning of the year.
Globally the U.S. dollar gained on Friday after data showed a key inflation measure came in line with forecasts, while personal spending and income increased, supporting expectations the Federal Reserve will likely cut interest rates by a smaller 25 basis points next month, instead of 50 bps, Reuters reported.
The dollar rose 0.8% to 146.09 yen after the inflation data, for its largest daily gain in two weeks. It was up 1.2% for the week, on track for its biggest weekly rise since mid-June.
The dollar index, a gauge of its value against six major peers, climbed to a 10-day high after the inflation data and was last up 0.3% at 101.7. On the week, it rose 1%, on track for its best weekly performance since early April.