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# MSC2077 - Rooms V5
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This MSC proposes creating a new room version named v5, which will enforce the
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signing key `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 that servers change the default room version used when
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creating new rooms, and it is not yet proposed that servers recommend upgrading
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existing rooms to v5.
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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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