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Upgrade Ruby from 2.2 to 2.5
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Description

The current Docker image for Tommy uses 2.2, not 2.5.

Ysul
$ rvm install 2.2

Install of ruby-2.2.10 - #complete
Please be aware that you just installed a ruby that requires        1 patches just to be compiled on an up to date linux system.                              
This may have known and unaccounted for security vulnerabilities.
Please consider upgrading to ruby-2.5.1 which will have all of the latest security patches.