Unable to install with Logstash 2.4

[jmswick]

Hello,
I would like to use this codec for logfmt with logstash. However, it appears that it is incompatible with the newer releases of Logstash past version 2. As I receive the following error when trying to install the codec on the latest release of logstash:

root@localhost:/opt/logstash $ ./bin/logstash --version
logstash 2.4.0
root@localhost:/opt/logstash $ ./bin/logstash-plugin install logstash-codec-logfmt
Validating logstash-codec-logfmt
Installing logstash-codec-logfmt
Plugin version conflict, aborting
ERROR: Installation Aborted, message: Bundler could not find compatible versions for gem "logstash-core":
  In snapshot (Gemfile.lock):
    logstash-core (= 2.4.0)

  In Gemfile:
    logstash-core-plugin-api (= 1.60.4) java depends on
      logstash-core (<= 2.4.99, >= 2.4.0) java

    logstash-output-zeromq (< 3.0.0) java depends on
      logstash-core (< 3.0.0, >= 2.0.0.beta2) java

    logstash-output-zeromq (< 3.0.0) java depends on
      logstash-mixin-zeromq (>= 2.0.0) java depends on
        logstash-core (< 3.0.0, >= 2.0.0) java

    logstash-codec-logfmt (>= 0) java depends on
      logstash-core (< 2.0.0, >= 1.4.0) java

    logstash-core (= 2.4.0) java

Running `bundle update` will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict.

From looking at the gemspec, it depends on logstash-core < 2.0.0, which looks to be the source of the incompatibility.

Will this codec be seeing any further updates for newer version of Logstash?

Thank you.