Vietcombank sold the dollar at VND24,500, up 0.16% from Thursday.
The State Bank of Vietnam reduced its reference rate by 0.01% to VND24,060.
The dollar was sold at VND24,350 on the black market, down 0.33%.
It has gained over the dong by 3.24% since the beginning of the year.
Globally the yen fell on Friday after the Bank of Japan (BOJ) maintained its ultra-loose monetary policy stance in a keenly awaited rate decision, while the dollar stood near a six-month peak on the prospect of higher-for-longer U.S. rates, Reuters reported.
The Japanese currency fell 0.4% against the dollar after the BOJ kept ultra-low rates and its dovish guidance on future monetary policy, even as Governor Kazuo Ueda had earlier this month said the central bank could have enough data by year-end to determine whether it can end negative rates.
The U.S. dollar rode Treasury yields higher and against a basket of currencies, the greenback gained 0.1% to 105.50, not far from the previous session's six-month high of 105.74.