The last time Google has confirmed a refresh or update to the Penguin algorithm was back in October 2012 with the 3rd Penguin update. The last update was 4.5 months ago, whereas Google’s Panda algorithm is pushed out monthly. Confusion Over Penguin Refreshes In a recent Google Webmaster…

Please visit Search Engine Land for the full article.

Link:

No, Google Hasn’t Released Unannounced Peguin Updates