The NDP-dominated parliament passed the amendment on Tuesday
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Egypt will hold a referendum on 25 May on a constitutional amendment to allow more than one candidate to stand in presidential elections.
"25 May shall be a day of national pride, as Egyptians... make a new dawn," a statement issued by the ruling National Democratic Party (NDP) said.
The revision was endorsed on Tuesday by an overwhelming majority in parliament.
But opposition groups oppose a change, saying its strict conditions mean only NDP members will be able to stand.
The amendment stipulates that independent presidential candidates must have the support of at least 65 out of a total of 444 MPs - 90% of whom are from the NDP.
Political party candidates have fewer restrictions, but the parties face the hurdle of being recognised by a NDP-dominated committee.
The main legal opposition party, al-Wafd, says it will boycott the vote and urged Egyptians to stay at home on 25 May.
The banned Muslim Brotherhood called on supporters to vote against the amendment.