Exhibit 32.1

CERTIFICATIONS

PURSUANT TO SECTION 18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Each of the undersigned, in his capacity as the principal executive officer or principal financial officer of Mitek Systems, Inc. (the “Company”), as the case may be, 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 the best of his knowledge:

1.This Quarterly Report of the Company on Form 10-Q for the period ended June 30, 2023 (this “Quarterly Report”) 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 this Quarterly Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

October 26, 2023	/s/ Scipio Maximus Carnecchia
	Scipio Maximus Carnecchia
	Chief Executive Officer (Principal Executive Officer)

October 26, 2023	/s/ Fuad Ahmad
	Fuad Ahmad
	Interim Chief Financial Officer (Interim Principal Financial and Accounting Officer)

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission (“SEC”) or its staff upon request.

This certification accompanies this Quarterly Report to which it relates, is not deemed filed with the SEC and is not to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act (whether made before or after the date of this Quarterly Report), irrespective of any general incorporation language contained in such filing.