Contagion fears from neighbouring Spain's budget troubles and the slow progress of much-needed structural reforms have halted a falling trend for Italy's debt costs.
The authorities were quick to point to factors beyond Italy's shores.
"Even though demand was strong, as had been expected, the result of the auction reflected increased tensions on sovereign bonds in the euro area that resulted in a significant increase in yields," the central bank said in a statement.
Italy's industry minister said the rise in borrowing costs was not a reaction to the government's planned labour reforms.
One-year yields had been declining since mid-November when they hit a euro lifetime record of 6 percent.