Karen Grunberg blogging for Google reports that, “The Stable channel has been updated to. While Google never said anything about incrementing Chrome on Leopard one last time, a recent update on the Stable channel indicates that this is the case. “In addition, you’ll be unable to install Chrome on any Mac still running 10.5 (which is an OS X version also no longer being updated by Apple),” it added. “If you already have Chrome installed, you can still use Chrome, but it will no longer be auto-updated,” the company behind the world’s biggest search engine said. Last week, Google issued a memo to Mac users of its Chrome web browser informing the Leopard install-base that version 21 was the last they’d see on the five-year old Mac OS. The iOS version of the browser has been updated as well. Search giant Google is rolling out what is likely the last incremental release of Chrome 21 for Leopard users, squashing any remaining bugs before moving onto releases that target newer versions of OS X.