Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Voyager Therapeutics, Inc. (the “Company”) for the period ended June 30, 2026, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned officers hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 that to his or her knowledge:

 

1)
the Report which this statement accompanies fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

 

2)
the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

 

Date: August 6, 2026

 

/s/ Alfred Sandrock

 

 

Alfred Sandrock

 

 

Chief Executive Officer, President, and Director

(Principal Executive Officer)

 

 

 

Date: August 6, 2026

 

/s/ Robin Swartz

 

 

Robin Swartz

 

 

Chief Operating Officer and Chief Business Officer

(Principal Financial Officer)