Error while upgrade Plone 5.1.5 to 5.2

While buildout

Error: Couldn't find a distribution for 'trollius==2.2'.

Can anyone suggest a fix?

The cause of the problem is described in "". Solution: look at PyPI to find out what version is made available and update the version pin to that version.

1 Like is where to look. Currently showing 2.2.post1 Jul 29, 2019

So anyone have success upgrade to upgrade a production 5.1.5 to 5.2? Can you provide the step of upgrade?