This patch release includes a number of bug fixes, including a fix for an issue with session state expiration.
sha256 for apache-geode-1.13.3.tgz is c725d01336b94e4c47a921825aa1616872754def202ee1c72074156c3a3848d1
See full release notes at https://cwiki.apache.org/confluence/display/GEODE/Release+Notes#ReleaseNotes-1.13.3