# Input plugin runtime dependency

**URL:** <https://discuss.elastic.co/t/input-plugin-runtime-dependency/57220>\
**Category:** Logstash\
**Created:** [August 4, 2016, 1:14pm UTC](https://discuss.elastic.co/t/input-plugin-runtime-dependency/57220 "2016-08-04T13:14:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![cmeerbeek](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/cmeerbeek/32/11030_2.png) [@cmeerbeek](https://discuss.elastic.co/u/cmeerbeek)\
**Post date:** [August 4, 2016, 1:14pm UTC](https://discuss.elastic.co/t/input-plugin-runtime-dependency/57220/1 "2016-08-04T13:14:15Z")

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Another thing I cannot figure out.

I have developed a logstash input plug-in but during installation I now have a depedency to logstash-core 5.... Why?

My gemspec file contains:  
s.add\_runtime\_dependency "logstash-core", "\>= 2.0.0", "\< 3.0.0"  
s.add\_runtime\_dependency 'logstash-codec-plain'

And suddenly this requires an alpha version of a new logstash-core gem...  
What is the correct runtime dependency configuration for working the the lastest STABLE logstash gems?

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 6, 2017, 4:44am UTC](https://discuss.elastic.co/t/input-plugin-runtime-dependency/57220/2 "2017-07-06T04:44:53Z")

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