Yields for short-term Treasury securities rose at Monday's regular weekly auction to the highest levels since October.

The Treasury Department auctioned $6.408 billion worth of 13-week bills at an average discount of 6.31 percent, up from 6.13 percent at last week's auction.

The government also sold $6.402 billion worth of 26-week bills at an average discount of 6.51 percent, up from 6.41 percent last week.

The rates were the highest since the 13-week bills sold for 6.84 percent on Oct. 19 and the 26-week bills sold for 7.21 percent.