Ruby 2.4.2 availablility?

Ruby 2.4.2 was released today which contains security fixes. When can we see this available in CircleCI builds?

Build-agent version 0.0.4188-9ab0127 (2017-09-14T11:51:16+0000)
Starting container circleci/ruby:2.4.2-node
 image cache not found on this host, downloading circleci/ruby:2.4.2-node
 Error response from daemon: manifest for circleci/ruby:2.4.2-node not found
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Here’s our update policy for build images:

If you are using CircleCI 2.0, which it looks like you are, this the 48 hours starts after the official Docker Ruby images get updated. Currently, they aren’t: