The International Monetary Fund (IMF) on Wednesday urged Germany to boost its investment in its public infrastructure.

"Boosting public investment, women's employment, and competition in the services sector now would help face the challenges that loom further ahead," IMF mission chief for Germany, Enrica Detragiache, said.

The IMF expects Germany's economy to expand 1.6% in 2015 and 1.7% in 2016 due to a weaker euro and lower energy prices.

The lender forecast the German current account surplus to rise to 8.4% of gross domestic product (GDP) this year from 7.6% of GDP in 2014, caused by weak domestic demand and saving in the economy.