diff --git a/changelog.d/14032.feature b/changelog.d/14032.feature
new file mode 100644
index 000000000000..bb221d3ca605
--- /dev/null
+++ b/changelog.d/14032.feature
@@ -0,0 +1 @@
+Advertise Matrix 1.3 support on `/_matrix/client/versions`.
diff --git a/synapse/rest/client/versions.py b/synapse/rest/client/versions.py
index 280d30648317..18ed313b5c00 100644
--- a/synapse/rest/client/versions.py
+++ b/synapse/rest/client/versions.py
@@ -75,6 +75,7 @@ def on_GET(self, request: Request) -> Tuple[int, JsonDict]:
                     "r0.6.1",
                     "v1.1",
                     "v1.2",
+                    "v1.3",
                 ],
                 # as per MSC1497:
                 "unstable_features": {