The referendum on changing the Russian constitution will take place on July 1. The change aims to ensure that President Vladimir Putin can stay on longer.
Putin himself announced the new date on Monday.
The vote was scheduled for April 22 but was postponed due to the coronavirus.
The changes have already been approved in parliament and by the Constitutional Court of Russia.
If the people also agree, Putin can remain president for two more six-year terms if he is re-elected.
Then he can stay in power until 2036.