The December 10-year JGB futures closed 0.04 point higher at 150.05, with a trading volume of 16,126 lots.
The yield on the benchmark 10-year JGB slipped 0.5 basis point to 0.150 percent, off a 2-1/2-year high of 0.155 percent last hit on Tuesday.
The 20-year JGB yield and the 30-year JGB yield both lost half a basis point to 0.680 and 0.940 percent, respectively.
The five-year JGB yield was flat at minus 0.065 percent.
The 40-year JGBs and two-year JGBs were untraded.
The Bank of Japan offered to buy government bonds with more than five to 10 years to maturity at its regular debt-purchasing operation on Wednesday, leaving the offer amounts unchanged from its previous operation.
Many market players expect the BOJ to avoid trying to keep a tab on rising yields until the 10-year JGB yield nears 0.200 percent.
US long-dated Treasuries gained on Tuesday, as investors took a respite from selling bonds that took yields to multi-year highs following recent economic data and on interest rate prospects over the next year and a half.