A motion to alter or supplement the Constitution of the Republic of Lithuania may be submitted to the Seimas by a group of not less than 1/4 of all the Members of the Seimas or not less than by 300,000 voters.
During a state of emergency or martial law, the Constitution may not be amended.
The provision “The State of Lithuania shall be an independent democratic republic” of Article 1 of the Constitution may be altered only by referendum if not less than 3/4 of the citizens of Lithuania with the electoral right vote in favour thereof.
The provisions of the First Chapter “The State of Lithuania” and the Fourteenth Chapter “The Alteration of the Constitution” may be altered only by referendum.
Amendments to the Constitution concerning other chapters of the Constitution must be considered and voted at the Seimas twice. There must be a break of not less than three months between the votes. A draft law on the alteration of the Constitution shall be deemed adopted by the Seimas if, during each of the votes, not less than 2/3 of all the Members of the Seimas vote in favour thereof.
A failed amendment to the Constitution may be submitted to the Seimas for reconsideration not earlier than after one year.
The President of the Republic shall sign an adopted law on the alteration of the Constitution and officially promulgate it within five days.
If the President of the Republic does not sign and promulgate such a law within the specified time, this law shall come into force when the Speaker of the Seimas signs and promulgates it.
A law on the alteration of the Constitution shall come into force not earlier than one month after its adoption.
The constituent part of the Constitution of the Republic of Lithuania shall be:
The Constitutional Law “On the State of Lithuania” of 11 February 1991;
The Constitutional Act “On the Non-Alignment of the Republic of Lithuania to Post-Soviet Eastern Unions” of 8 June 1992;
The Law “On the Procedure for the Entry into Force of the Constitution of the Republic of Lithuania” of 25 October 1992;
The Constitutional Act “On Membership of the Republic of Lithuania in the European Union” of 13 July 2004.
This Constitution of the Republic of Lithuania shall come into force on the day following the official publication of the results of the Referendum provided that more than half of the citizens of the Republic of Lithuania with the electoral right give their consent to this Constitution in the Referendum.
The procedure for the entry into force of this Constitution and separate provisions thereof shall be regulated by the Law of the Republic of Lithuania “On the Procedure for the Entry into Force of the Constitution of the Republic of Lithuania”, which, together with this Constitution of the Republic of Lithuania, shall be adopted by referendum.
After the adoption of this Constitution of the Republic of Lithuania by referendum, the Seimas of the Republic of Lithuania, by 25 October 1993, may alter, by a 3/5 majority vote of all the Members of the Seimas, the provisions of this Constitution of the Republic of Lithuania contained in Articles 47, 55, 56, Item 2 of the second paragraph of Article 58, in Articles 65, 68, 69, Items 11 and 12 of Article 84, the first paragraph of Article 87, in Articles 96, 103, 118, and in the fourth paragraph of Article 119.
The Constitution of the Republic of Lithuania and the Law of the Republic of Lithuania “On the Procedure for the Entry into Force of the Constitution of the Republic of Lithuania”, adopted by referendum, shall be signed and, within 15 days, promulgated by the Chairman of the Supreme Council of the Republic of Lithuania.