# Getting a warning while using the latest version of logstash 1.5.3

**URL:** <https://discuss.elastic.co/t/getting-a-warning-while-using-the-latest-version-of-logstash-1-5-3/26379>\
**Category:** Logstash\
**Created:** [July 28, 2015, 2:21am UTC](https://discuss.elastic.co/t/getting-a-warning-while-using-the-latest-version-of-logstash-1-5-3/26379 "2015-07-28T02:21:16Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Kuldip\_Madnani](https://avatars.discourse-cdn.com/v4/letter/k/e9bcb4/32.png) [@Kuldip\_Madnani](https://discuss.elastic.co/u/Kuldip_Madnani)\
**Post date:** [July 28, 2015, 2:21am UTC](https://discuss.elastic.co/t/getting-a-warning-while-using-the-latest-version-of-logstash-1-5-3/26379/1 "2015-07-28T02:21:16Z")

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Command executed : /opt/app/logstash/bin/logstash --configtest --config /home/logstash/apache.config

Warning received : '[DEPRECATED] use `require 'concurrent'` instead of `require 'concurrent_ruby'`  
Configuration OK

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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [July 28, 2015, 2:35am UTC](https://discuss.elastic.co/t/getting-a-warning-while-using-the-latest-version-of-logstash-1-5-3/26379/2 "2015-07-28T02:35:32Z")

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Providing your config would probably help us help you.

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**Author:** ![suyograo](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/suyograo/32/44898_2.png) [@suyograo](https://discuss.elastic.co/u/suyograo)\
**Post date:** [July 28, 2015, 6:04am UTC](https://discuss.elastic.co/t/getting-a-warning-while-using-the-latest-version-of-logstash-1-5-3/26379/3 "2015-07-28T06:04:41Z")

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> [@Kuldip\_Madnani](#):
>
> Warning received : '[DEPRECATED] use require 'concurrent' instead of require 'concurrent\_ruby'

This is benign, you can ignore it. We'll fix it

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**Author:** ![suyograo](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/suyograo/32/44898_2.png) [@suyograo](https://discuss.elastic.co/u/suyograo)\
**Post date:** [July 28, 2015, 6:06am UTC](https://discuss.elastic.co/t/getting-a-warning-while-using-the-latest-version-of-logstash-1-5-3/26379/4 "2015-07-28T06:06:40Z")

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> [@Kuldip\_Madnani](#):
>
> Warning received : '[DEPRECATED] use require 'concurrent' instead of require 'concurrent\_ruby'

Tracking here [concurrent ruby warning received when starting LS 1.5.3 · Issue #3662 · elastic/logstash · GitHub](https://github.com/elastic/logstash/issues/3662)

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**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, 5:33am UTC](https://discuss.elastic.co/t/getting-a-warning-while-using-the-latest-version-of-logstash-1-5-3/26379/5 "2017-07-06T05:33:42Z")

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