# Version requirements in shard.yml the "crystal" field

**URL:** <https://forum.crystal-lang.org/t/version-requirements-in-shard-yml-the-crystal-field/3350>\
**Category:** Help & Support\
**Created:** [June 4, 2021, 10:01pm UTC](https://forum.crystal-lang.org/t/version-requirements-in-shard-yml-the-crystal-field/3350 "2021-06-04T22:01:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![szabgab](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.crystal-lang.org/szabgab/32/1278_2.png) [@szabgab](https://forum.crystal-lang.org/u/szabgab)\
**Post date:** [June 4, 2021, 10:01pm UTC](https://forum.crystal-lang.org/t/version-requirements-in-shard-yml-the-crystal-field/3350/1 "2021-06-04T22:01:28Z")

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I am trying to understand how the crystal version requirement in shard.yml works.  
I understand this “\>= 1.0.0” and this “\>= 1.0.0, \< 2.0.0” , a bit harder, but the [docs](https://github.com/crystal-lang/shards/blob/master/docs/shard.yml.adoc) also explain the ~ (e.g. “~\> 1”)

However I also saw a few shards that have one of the following:  
“\>= 0.36.0 - 1.0”  
“\>= 0.36.0 - 1.0”  
“0.25.0 - 1.0”  
Are these valid values for the “crystal” field?

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**Author:** ![straight-shoota](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.crystal-lang.org/straight-shoota/32/36_2.png) [@straight-shoota](https://forum.crystal-lang.org/u/straight-shoota)\
**Post date:** [June 5, 2021, 10:24am UTC](https://forum.crystal-lang.org/t/version-requirements-in-shard-yml-the-crystal-field/3350/2 "2021-06-05T10:24:35Z")

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No, they are not.