Dyne Therapeutics, Inc.

STATE OF DELAWARE

CERTIFICATE OF AMENDMENT

OF CERTIFICATE OF INCORPORATION

Pursuant to Section 242 of the General Corporation Law of the State of Delaware, Dyne Therapeutics, Inc., a corporation organized under and existing by virtue of the General Corporation Law of the State of Delaware (“DGCL”), DOES HEREBY CERTIFY:

The name of the corporation is Dyne Therapeutics, Inc. (the “Corporation”).

The date of filing the original Certificate of Incorporation of this Corporation with the Secretary of State of the State of Delaware was December 1, 2017.

Resolutions were duly adopted by the Board of Directors of the Corporation setting forth this proposed Amendment to the Certificate of Incorporation and declaring said amendment to be advisable and calling for the consideration and approval thereof at a meeting of the stockholders of the Corporation.

The Certificate of Incorporation is hereby amended by amending and restating the Article thereof numbered “SEVENTH” in its entirety as follows:

“To the fullest extent permitted by the General Corporation Law of the State of Delaware, no director or officer of the Corporation shall be personally liable to the Corporation (in the case of directors) or its stockholders (in the case of directors and officers) for monetary damages for any breach of fiduciary duty as a director or officer. No amendment, repeal or elimination of this provision shall apply to or have any effect on its application with respect to any act or omission of a director or officer occurring before such amendment, repeal or elimination. If the General Corporation Law of the State of Delaware is amended to permit further elimination or limitation of the personal liability of directors or officers, then the liability of a director or officer of the Corporation shall be eliminated or limited to the fullest extent permitted by the General Corporation Law of the State of Delaware as so amended.”

The foregoing amendment was effected pursuant to a resolution of the Board of Directors of said corporation.

Thereafter, pursuant to a resolution by the Board of Directors, this Certificate of Amendment was submitted to the stockholders of the Corporation for their approval in accordance with the provisions of Section 242 of the DGCL. Accordingly, said proposed amendment has been adopted in accordance with Section 242 of the DGCL.

IN WITNESS WHEREOF, Dyne Therapeutics, Inc. has caused this certificate to be signed this [] day of [], 2026

By: _______________________

Name:

Title: