On behalf of Zope developer community I am pleased to announce the releases of Zope 4.8 and 5.5.
These releases add improved cookie handling (see enhanced cookie support by d-maurer · Pull Request #1010 · zopefoundation/Zope · GitHub) in addition to a few bug fixes.
For the full list of changes see the change logs at Change log — Zope documentation 4.6 documentation and Change log — Zope documentation 5.3 documentation.
Installation instructions can be found at Installing Zope — Zope documentation 4.6 documentation and Installing Zope — Zope documentation 5.3 documentation.