The yen was weaker on Wednesday as a cautious risk-on mood dampened safe haven demand, while the euro was steady ahead of the upcoming European Central Bank meeting on Thursday.
The euro was little changed against the U.S. dollar at 1.1043 by 02:38 AM ET (06:38GMT).
The dollar pushed higher against the yen, climbing 0.25% to 107.78.
The British pound has managed to hold on to last week's gains after British parliament passed a law compelling Prime Minister Boris Johnson to seek a delay to the Oct. 31 date for leaving the European Union. Sterling last traded at 1.2365.