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+---
+  date: '2021-07-13'
+  title: Synapse 1.38.0 released
+  categories:
+    - Releases
+  author: Dan Callahan
+---
+
+Synapse 1.38.0 is out now!
+
+## (Big) Integers
+
+Synapse's database schema used `integer` columns in a few places where values could potentially overflow a maximum value of 2<sup>31</sup>. One such column is `events.stream_ordering`, which surpassed 2<sup>31</sup> on matrix.org last week.
+
+To prevent overflows, Synapse 1.38 will automatically convert several `integer` columns to `bigint` as a background update. While homeservers will function normally during this task, it could result in increased disk I/O for several hours or days. Note that **homeservers may need several gigabytes of free space** to successfully rebuild associated database indexes and complete the upgrade.
+
+See the [upgrade notes](https://matrix-org.github.io/synapse/v1.38/upgrade.html#upgrading-to-v1380) for more details.
+
+## Expiring Caches
+
+Synapse has a new configuration option, `caches.expiry_time`, which can be set to enable evicting items from caches if they go too long without being accessed. This helps servers reclaim memory used by large yet infrequently used caches.
+
+## Smaller Sync Responses
+
+The response to `/sync` now omits optional keys when they would otherwise be empty. This can significantly reduce the size of incremental syncs, as demonstrated in [#6579](https://github.com/matrix-org/synapse/issues/6579). Thanks to deepbluev7 for  initially submitting this in [#9919](https://github.com/matrix-org/synapse/pull/9919), which made it into this release via [#10214](https://github.com/matrix-org/synapse/pull/10214).
+
+## Everything Else
+
+A few other items worth calling out:
+
+- This release includes an experimental implementation of [MSC2918: Refresh tokens](https://github.com/matrix-org/matrix-doc/pull/2918), which adds initial support for complementary access / refresh tokens in line with OAuth best practices ([#9450](https://github.com/matrix-org/synapse/pull/9450)).
+- Synapse now [ships a script](https://github.com/matrix-org/synapse/pull/10290) to review recently registered accounts, which can be useful in cleaning up servers in the wake of malicious, automated registrations like we witnessed during last month's [spam attack](https://matrix.org/blog/2021/06/30/security-update-synapse-1-37-1-released).
+- We've also fixed a few rough edges ([#10263](https://github.com/matrix-org/synapse/pull/10263), [#10303](https://github.com/matrix-org/synapse/pull/10303), [#10336](https://github.com/matrix-org/synapse/pull/10336)) in the spam mitigations from 1.37.1, and would encourage you to update.
+- The [Admin API for querying user information](https://matrix-org.github.io/synapse/v1.38/admin_api/user_admin_api.html) now includes information about a user's SSO identities in its response.
+
+These are just the highlights; please see the [Upgrade Notes](https://matrix-org.github.io/synapse/v1.38/upgrade.html#upgrading-to-v1380) and [Release Notes](https://github.com/matrix-org/synapse/blob/v1.38.0/CHANGES.md) for a complete list of changes in this release.
+
+Synapse is a Free and Open Source Software project, and we'd like to extend our thanks to everyone who contributed to this release, including [deepbluev7](https://github.com/deepbluev7), [dklimpel](https://github.com/dklimpel), [fkr](https://github.com/fkr), and [sideshowbarker](https://github.com/sideshowbarker)
+