That is more than 100 less than the previous death toll, which was 359.
In a statement, the Department of Health claimed that the death toll previously published by the ministry was 290 and not 359 according to media reports.
A police spokesman in Colombo told CNN Tuesday that the death toll had increased to 359.
"Some of the bodies are severely damaged by this type of explosion, and it is possible that some bodies are completely destroyed or broken into pieces, making it difficult to identify entire bodies," the ministry said. "It is therefore a challenge to count an exact death toll."
In a series of coordinated suicide bombings in Sri Lankan churches and hotels, numerous people were killed and hundreds were wounded on Sunday by a little-known terrorist group.
A massive international criminal investigation of the attacks is under way. Six foreign police departments and Interpol support the local police, including Scotland Yard from the UK and the FBI from the United States.