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# MSC2077 - Room version 5
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This MSC proposes creating room version 5, which will enforce the signing key
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`valid_until_ts` timestamps proposed in
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[MSC2076](https://github.com/matrix-org/matrix-doc/issues/2076).
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## Proposal
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The new room version is called `5`. The only difference between v5 and v4 is
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that v5 rooms enforce the `valid_until_ts` timestamp on signing keys as
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proposed in [MSC2076](https://github.com/matrix-org/matrix-doc/issues/2076).
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It is not yet proposed to change the default room version to v5. Version 5 will
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be considered a "stable" version.
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## Notes
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See also [MSC2002](./2002-rooms-v4.md), which proposed room v4 but also
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mentioned that a v5 was anticipated and gave some context for this change.
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