Mali's security forces are set to vote a week before the referendum, which is to be held on June 18.
The referendum was originally planned for March but was postponed at short notice.
The voted will be linked to consultations and reforms aimed at helping the country return to a civilian government.
The referendum is seen as the basis for next year's elections, which the military government has pledged to hold by March.
The military seized power from a transitional government in 2021, pledging initially to hold elections in February 2022.
But these were later cancelled, with the military setting a time frame of five years to hold a democratic vote.
The military government maintains close contact with Russia and is reported to have hired the Wagner Group of Russian mercenaries.
In response, France, the former colonial power, terminated its counterterrorism operation in Mali and withdrew its forces last year.
The German government decided this week to end its participation in the United Nations' MINUSMA peace mission which had the participation of about 1100 Bundeswehr troops.
The mission, which the parliament still has to agree on, is set to end on May 31 next year after almost 11 years.
