Ireland's economy has been the best performing in Europe since 2014 and the Finance Ministry, whose figures form the basis of the government's budget policies, previously predicted GDP growth of 3.5 percent for 2018 and 3.2 percent for 2019.
The sharp upgrade for this year surpasses the country's central bank which last week increased its GDP forecasts to 4.8 percent. It predicts growth of 4.2 percent in 2019.
Statistical distortions related to Ireland's multinational sector have called into questioned the relevance of using Irish GDP to properly measure activity in the economy. Many economists instead rely on the labour market as a more accurate barometer.
Unemployment is set to fall to 5.8 percent this year from a high of 16 percent in 2012, according to the updated figures, with the rate forecast to remain at 5.3 percent over the following two years as the economy reaches full employment.