As per the latest signal, the webmasters are predicting a possible Google algorithm update on Saturday, 21 July, 2018. Most of the tracking tools have noticed a sign of update though there is no confirm news. According to the webmasters, the updates are more related to mobile website than the desktop version.
As there is no official confirmation of the news, it is very tough to say what exactly happened in that update. It seems that it did not affect too many websites in the index.
Here are some of the tools that track this:
If you have noticed any such change in your website then please let us know.