There has been another hotfix update to Z-Push 2.3.5 which has now the version number 2.3.5+5.
This is only relevant to users that use the IMAP backend.
The IMAP backend can not be installed/updated to 2.3.5 on RHEL+CentOS due to the missing php-awl package dependency.
More information is in these tickets:
https://jira.z-hub.io/browse/ZP-1155 REVERT: [IMAP] iOS mail with z-push preview show raw html
https://jira.z-hub.io/browse/ZP-1191 Z-Push 2.3.5 breaks CentOS updates / libawl invalid dependency
These fixes are available only in git and the repositories.