We are having problems upgrading from flink 1.13 to flink 1.17, since we are running older version of zookeeper ( 3.4.x). Starting with Flink 1.15 , flink is using Apache Curator library from 2.x to 5.2. “Apache Curator is a Java/JVM client library for Apache ZooKeeper, What that means is described in https://curator.apache.org/breaking-changes.html, but short version is that Zookeeper 3.4.x is no longer supported from flink 1.15. Did anyone manage to use older version of apache curator in latest flink, so we can still use our old zookeeper ( which we can't upgrade at this time )