At 08:40 in Lisbon, the yield on 10-year bonds increased to 2.979%, up from 2.973% on Thursday.
The five-year bond yields also rose to 2.227%, compared to 2.212% in the previous session.
Similarly, two-year bond yields climbed to 1.760%, compared to 1.738% on Thursday.
Germany’s 10-year bond yields, regarded as the most secure in Europe, rose to 2.459%, up from 2.446% in the previous session.
