Plone released (fix regression)

For technical wizards who want to jump straight in, here are two important links:


Major changes since

  • Fix regression after Zope security fix. The layout_view was rendered as plain text instead of html. Note that this is not used by core Plone, but is in use by several tile-related ecosystem packages, for example Mosaic.
  • Zope: revert updates to dependency package versions.
    • Plone 5.2.10 extends the versions.cfg or constraints from Zope 4.8.3.
    • Plone extends the versions.cfg or constraints from Zope 4.8.6. This has the security fix and related regression fixes, plus lots of dependency package updates. This includes a Datetime update which can cause problems on Python 2. There may be other problems that we have not seen yet.
    • Plone now extends the versions.cfg or constraints from Zope 4.8.3, and only overrides the Zope version pin to 4.8.6. So you have the security fix and related regression fixes, but keep the dependency package versions the same as originally.

Python compatibility

This release supports Python 2.7, 3.7, and 3.8.

Python 3.6 is no longer supported. See the community announcement. Note that both Python 2.7 and 3.6 have reached end of life. This means the wider Python community no longer supports it. For example, the default WSGI server used by Plone, which is waitress, has a security problem that is only solved on Python 3.7 and higher. If you use waitress on earlier Python versions, you are vulnerable.

Python 3.7 will reach end of life in June 2023. See Status of Python Versions for the canonical information. It will get harder to test and support Plone on unsupported Python versions.

Especially Python 2.7 should only be used as a temporary stepping stone before you migrate your Plone site to Python 3.


For installation instructions, see the documentation.


If you find any issues, please report them in the main issue tracker.