Github user uce commented on the issue: https://github.com/apache/flink/pull/5395 https://ci.apache.org/builders/flink-docs-master/builds/977/steps/Flink%20docs/logs/stdio says ``` Ruby version: ruby 2.0.0p384 (2014-01-12) [x86_64-linux-gnu] ``` I can ask INFRA whether it is possible to run a more recent Ruby version.
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