In this article, Joanna Strozak and Julie Weller of Mathews, Dinsdale & Clark LLP provide an overview of recent updates to Ontario's workers' compensation legislation and WSIB policy. They examine legislative amendments to the Workplace Safety and Insurance Act, 1997 through Bills 190 and 229, as well as revisions to OPM Document No. 18-02-02, "Determining Short-Term Average Earnings", and other policy-related developments.