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 GSE Systems, Inc. (the “Company”) for the quarter ended June 30, 2024 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Ravi Khanna, President and Chief Executive Officer of the Company, and I, Emmett A. Pepe, Chief Financial Officer, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that,

1.	The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

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

Date: August 14, 2024	/s/ Ravi Khanna	/s/ Emmett A. Pepe
	Ravi Khanna	Emmett A. Pepe
	President and Chief Executive Officer	Chief Financial Officer