2013-09-03 18:08:28 +00:00
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---
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2013-09-06 16:08:09 +00:00
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page_title: "Backwards Compatibility"
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2013-09-03 18:08:28 +00:00
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sidebar_current: "installation-backwards-compatibility"
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---
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# Backwards Compatibility
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## For 1.0.x
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Vagrant 1.1+ provides full backwards compatibility for valid Vagrant 1.0.x
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Vagrantfiles which don't use plugins. After installing Vagrant 1.1, your 1.0.x environments should
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continue working without modifications, and existing running machines will
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continue to be managed properly.
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If you use any Vagrant 1.0.x plugins, you must remove references to these from
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your Vagrantfile prior to upgrading. Vagrant 1.1+ introduces a new plugin
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format that will protect against this sort of incompatibility from ever
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happening again.
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If your Vagrantfile doesn't just work with 1.1 and doesn't use any plugins,
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please [report a bug](https://github.com/mitchellh/vagrant/issues).
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## For 1.x
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Backwards compatibility between 1.x is not promised, and Vagrantfile
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syntax stability isn't promised until 2.0 final. Any backwards incompatibilities
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within 1.x will be clearly documented.
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This is similar to how Vagrant 0.x was handled. In practice, Vagrant 0.x
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only introduced a handful of backwards incompatibilities during the entire
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development cycle, but the possibility of backwards incompatibilities
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is made clear so people aren't surprised.
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Vagrant 2.0 final will have a stable Vagrantfile format that will
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remain backwards compatible, just as 1.0 is considered stable.
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