§ 161. The right to initiate amendment of the Constitution shall rest with not less than one-fifth of all members of the Riigikogu and with the President of the Republic.
Amendment of the Constitution cannot be initiated, nor can the Constitution be amended, during a state of emergency or a state of war.
§ 162. Chapter I “General Provisions” and Chapter XV “Amendment of the Constitution” of the Constitution can be amended only by a referendum.
§ 163. The Constitution can be amended by a law which has been adopted by:
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a referendum;
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two successive compositions of the Riigikogu;
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the Riigikogu, as a matter of urgency.
A bill to amend the Constitution shall be debated in three readings in the Riigikogu, whereby the interval between the first and second readings shall be not less than three months, and the interval between the second and third readings shall be not less than one month. The manner in which the Constitution is to be amended shall be decided at the third reading.
§ 164. A three-fifths majority of all members of the Riigikogu is required to submit a bill to amend the Constitution to a referendum. The referendum shall be held not earlier than three months after the adoption of such resolution by the Riigikogu.
§ 165. In order to amend the Constitution by two successive compositions of the Riigikogu, a bill to amend the Constitution must receive the support of the majority of all members of the Riigikogu.
If the bill to amend the Constitution which received the support of the majority of all members of the preceding Riigikogu is adopted by the succeeding Riigikogu, unamended, at its first reading and with a three-fifths majority of all members of the Riigikogu, then the law to amend the Constitution is adopted.
§ 166. A resolution to consider a bill to amend the Constitution as a matter of urgency shall be adopted by a four-fifths majority of the Riigikogu. In this case, the law to amend the Constitution shall be adopted by a two-thirds majority of all members of the Riigikogu.
§ 167. A law to amend the Constitution shall be promulgated by the President of the Republic and shall enter into force on the date specified therein, but not earlier than three months after the date of promulgation.
§ 168. Amendment of the Constitution regarding the same issue cannot be initiated within one year after the rejection of a corresponding bill by a referendum or by the Riigikogu.