diff --git a/changelog.d/18647.feature b/changelog.d/18647.feature
new file mode 100644
index 000000000..a9c273bd2
--- /dev/null
+++ b/changelog.d/18647.feature
@@ -0,0 +1 @@
+Advertise support for Matrix v1.12.
\ No newline at end of file
diff --git a/synapse/rest/client/versions.py b/synapse/rest/client/versions.py
index f58f11e5c..fa39eb9e6 100644
--- a/synapse/rest/client/versions.py
+++ b/synapse/rest/client/versions.py
@@ -112,6 +112,7 @@ class VersionsRestServlet(RestServlet):
                     "v1.9",
                     "v1.10",
                     "v1.11",
+                    "v1.12",
                 ],
                 # as per MSC1497:
                 "unstable_features": {