diff --git a/CHANGES.md b/CHANGES.md
index a50d73fda9..ca5781f908 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,12 @@
+# Synapse 1.139.2 (2025-10-07)
+
+## Bugfixes
+
+- Fix a bug introduced in 1.139.1 where a client could receive an Internal Server Error if they set `device_keys: null` in the request to [`POST /_matrix/client/v3/keys/upload`](https://spec.matrix.org/v1.16/client-server-api/#post_matrixclientv3keysupload). ([\#19023](https://github.com/element-hq/synapse/issues/19023))
+
+
+
+
 # Synapse 1.139.1 (2025-10-07)
 
 ## Security Fixes
diff --git a/debian/changelog b/debian/changelog
index 8a90f45d5e..7b80f3379a 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+matrix-synapse-py3 (1.139.2) stable; urgency=medium
+
+  * New Synapse release 1.139.2.
+
+ -- Synapse Packaging team <packages@matrix.org>  Tue, 07 Oct 2025 16:29:47 +0100
+
 matrix-synapse-py3 (1.139.1) stable; urgency=medium
 
   * New Synapse release 1.139.1.
diff --git a/pyproject.toml b/pyproject.toml
index 93a8abc5f5..af67ec08a7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -101,7 +101,7 @@ module-name = "synapse.synapse_rust"
 
 [tool.poetry]
 name = "matrix-synapse"
-version = "1.139.1"
+version = "1.139.2"
 description = "Homeserver for the Matrix decentralised comms protocol"
 authors = ["Matrix.org Team and Contributors <packages@matrix.org>"]
 license = "AGPL-3.0-or-later"