Vietcombank sold the dollar at VND25,454, up 0.02% from Thursday.
The State Bank of Vietnam lowered its reference rate by 0.004% to VND24,242.
The greenback gained 0.12% to VND25,790 on the black market.
It has risen 4.15% against the dong since the beginning of the year.
Globally the dollar steadied against major peers on Friday, with currency moves muted as investors awaited the U.S. jobs report to confirm economic resiliency heading into the Federal Reserve's monetary policy meeting and a close-call U.S. presidential election next week, Reuters reported.
The dollar index, which measures the greenback against six major currencies, last rose 0.09% to 103.97.
The yen gave up some of Thursday's gains, sliding 0.31% to 152.49 per dollar as domestic traders grew cautious ahead of a three-day weekend in Japan amid big risk events.
Sterling was mostly unchanged at $1.2901, after tumbling to its lowest since mid-August at $1.28445 on Thursday.