Ibrahim Halawa's trial has been delayed for the 23rd time.
The Irishman was arrested in 2013 during demonstrations against the ousting of president Mohammed Morsi in Egypt.
Ibrahim has now spent 1,348 days in prison, since his arrest at the age of 17.
The Minister for Foreign Affairs Charlie Flanagan says "the case continues to be a high priority for the Government".
The next hearing is scheduled for May 17.
Amnesty International has declared Ibrahim Halawa a Prisoner of Conscience, based on its own eye-witness evidence that he could not have carried out the violent acts he is accused of.
“It is beyond farcical that almost four years after his arrest, Ibrahim Halawa’s trial has been delayed for the 23rd time. The continuing imprisonment of this young Irish and EU citizen is a serious violation of both international and Egyptian law.
"Over the last 45 months, Ibrahim’s ordeal has been nothing short of horrific. He has spent almost four years of his young life in harrowing conditions in a number of different prison cells,” said Fiona Crowley, Research and Legal Manager with Amnesty International Ireland.