Vietcombank sold the dollar at VND24,450, up 0.08% from Tuesday.
The State Bank of Vietnam raised its reference rate by 0.10% to VND23,951.
The greenback went up 0.08% to VND24,700 on the black market.
It has increased against the dong by 3.03% since the beginning of the year.
Globally, the dollar was near a two-week high against a basket of currencies on Wednesday as investors assessed U.S. economic data that showed a cooling labour market, while wagering the Federal Reserve will cut rates next year, Reuters reported.
The dollar index, which measures the U.S. currency against six rivals, was 0.019% higher at 103.99, having climbed 0.3% overnight. The index is up 0.5% this month, after sliding 3% in November, its steepest monthly decline in a year.
The euro was at $1.0795, having dropped to three-week low of $1.07785 on Tuesday.
Sterling was last at $1.2601, up 0.06% on the day. The Japanese yen strengthened 0.03% to 147.12 per dollar.