The Treasury sold $17 billion in three-month bills at a discount rate of 0.885%, up from 0.815% the previous week.
The Treasury also sold $18 billion in six-month bills at a rate of 0.950%, up from 0.840% the previous week.
The annualized yields on the securities are 0.903% for the three-month bills and 0.971% for the six-month bills.
Separately, the government said the cost of funds index for savings institutions in the Federal Home Loan Bank's 11th district fell to 2.13% in May from 2.208% in April. The index is a popular benchmark for adjustable-rate mortgages on the West Coast.