Vietcombank sold the dollar at VND26,430, up 0.11% from Monday.
The State Bank of Vietnam hiked its reference rate by 0.05% to VND25,243.
The dollar went up 0.19% to VND26,500 on the black market.
Globally the U.S. dollar held steady on Tuesday, with markets braced for a key consumer inflation report later in the day that could shape expectations for Federal Reserve interest rate cuts, Reuters reported.
The U.S. dollar index - which measures the currency against six counterparts, including the euro and yen - was steady at 98.497, after advancing 0.5% over the past two sessions.
Prior to that, the dollar had retreated as U.S. President Donald Trump's dovish-leaning pick to replace a Fed governor, and similarly inclined potential candidates for chairman, led traders to increase easing bets.