A federal appeals court on Friday reinstated a Biden administration rule requiring large companies to mandate COVID-19 vaccines or implement testing, though the ruling is unlikely to be the final word on the matter.

The Cincinnati-based U.S. Court of Appeals for the 6th Circuit lifted another court’s order from November that blocked the mandate from taking effect. Businesses with 100 or more employees would be required under the rule to stand up vaccine or regular testing requirements by Jan. 4 or face penalties of nearly $14,000 per violation.

A 2-1 majority of the court found that OSHA was likely within its legal authority to implement the "emergency temporary standard" requiring vaccines or testing.