# Upgrading Elastic Search from 5.6.3 to 6.8.2

**URL:** <https://discuss.elastic.co/t/upgrading-elastic-search-from-5-6-3-to-6-8-2/250797>\
**Category:** Elasticsearch\
**Created:** [October 2, 2020, 1:54pm UTC](https://discuss.elastic.co/t/upgrading-elastic-search-from-5-6-3-to-6-8-2/250797 "2020-10-02T13:54:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Philippe1](https://avatars.discourse-cdn.com/v4/letter/p/6bbea6/32.png) [@Philippe1](https://discuss.elastic.co/u/Philippe1)\
**Post date:** [October 2, 2020, 1:54pm UTC](https://discuss.elastic.co/t/upgrading-elastic-search-from-5-6-3-to-6-8-2/250797/1 "2020-10-02T13:54:19Z")

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Hi,

I'm upgrading my ES node from 5.6.3 to 6.8.2 on Linux CentOS 7.8.  
After installing ES, it fails to start with this error :  
Exception in thread "main" java.lang.NoSuchMethodError: org.elasticsearch.common.xcontent.XContentBuilder.getOutputStream()Ljava/io/OutputStream

Anybody knows why ?

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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:** [October 30, 2020, 1:54pm UTC](https://discuss.elastic.co/t/upgrading-elastic-search-from-5-6-3-to-6-8-2/250797/2 "2020-10-30T13:54:20Z")

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Closed on October 30, 2020, 1:54pm UTC

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