On June 29, 2023, the United States Supreme Court issued a unanimous opinion in Groff v. DeJoy, Postmaster General, increasing the employer’s burden to prove an undue hardship defense from the previous de minimis standard to a substantial hardship standard. Although the opinion is framed as a mere “clarification” of the Supreme Court’s 1977 decision in Trans World Airlines, Inc. v. Hardison, in practice, the law now requires employers to accommodate an employee’s religious beliefs under Title VII unless such accommodation would create a substantial hardship to the employer’s business.