Companies will have to use even more caution when handling employees who have filed whistleblower claims.

That's because the Occupational Safety and Health Administration (OSHA) updated its Whistleblower Investigations Manual to include new protections for whistleblowers. The update also makes it easier for employees to file whistleblower claims, requires investigators to follow new procedures when examining those claims, and increases the penalties for companies that violate the rules.

In a statement, the agency said the updated rules reflect OSHA commitment to ensure that workers are free to blow the whistle on corrupt corporate practices without fear of retaliation. “OSHA is committed ...