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Change default room version to 11. implements MSC4239 #18680

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Change default room version to 11. implements MSC4239 #18680

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7b72598
Change default room version to 11. implments MSC4239
ShadowRZ Jul 14, 2025
f58d9d1
Add changelog file
ShadowRZ Jul 14, 2025
258a7e0
Update changelog.d/18680.feature
reivilibre Jul 15, 2025
89e478e
fixup config doc
reivilibre Jul 15, 2025
a9cd65c
Fix unittests
ShadowRZ Jul 16, 2025
e4d5c98
Fix code style violations
ShadowRZ Jul 16, 2025
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1 change: 1 addition & 0 deletions changelog.d/18680.feature
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@@ -0,0 +1 @@
Change default room version to 11, implmenting [MSC4239](https://github.com/matrix-org/matrix-spec-proposals/pull/4239).
4 changes: 3 additions & 1 deletion docs/usage/configuration/config_documentation.md
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Expand Up @@ -342,7 +342,9 @@ For example, for room version 1, `default_room_version` should be set to "1".

_Changed in Synapse 1.76:_ the default version room version was increased from [9](https://spec.matrix.org/v1.5/rooms/v9/) to [10](https://spec.matrix.org/v1.5/rooms/v10/).

Defaults to `"10"`.
_Changed in Synapse 1.134:_ the default version room version was increased from [9](https://spec.matrix.org/v1.12/rooms/v10/) to [10](https://spec.matrix.org/v1.12/rooms/v11/).

Defaults to `"11"`.

Example configuration:
```yaml
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6 changes: 5 additions & 1 deletion schema/synapse-config.schema.yaml
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Expand Up @@ -265,7 +265,11 @@ properties:
_Changed in Synapse 1.76:_ the default version room version was increased
from [9](https://spec.matrix.org/v1.5/rooms/v9/) to
[10](https://spec.matrix.org/v1.5/rooms/v10/).
default: "10"
_Changed in Synapse 1.134:_ the default version room version was increased
from [10](https://spec.matrix.org/v1.12/rooms/v10/) to
[11](https://spec.matrix.org/v1.12/rooms/v11/).
default: "11"
examples:
- "8"
gc_thresholds:
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2 changes: 1 addition & 1 deletion synapse/config/server.py
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Expand Up @@ -158,7 +158,7 @@ def generate_ip_set(
"fec0::/10",
]

DEFAULT_ROOM_VERSION = "10"
DEFAULT_ROOM_VERSION = "11"

ROOM_COMPLEXITY_TOO_GREAT = (
"Your homeserver is unable to join rooms this large or complex. "
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