The source – seroundtable.com
On Friday, July 9th, there was a second jump in the July 2021 Google Core update. It is probably related to the completion of the July update.
We saw previous fluctuations in search results on July 2, but then they quickly calmed down.
Glenn Gabe asked Danny Sullivan of Google if the update had been made, and on Friday Danny said "not really."
Not quite done.— Danny Sullivan (@dannysullivan) July 9, 2021
There was a lot of talk on the forums about this, and the tracking tools showed big changes on July 9th as well.
Update: Google has confirmed that the update is complete today.