diff --git a/changelog.d/14576.feature b/changelog.d/14576.feature
new file mode 100644
index 000000000000..4fe8cb2667c8
--- /dev/null
+++ b/changelog.d/14576.feature
@@ -0,0 +1 @@
+Advertise support for Matrix 1.5 on `/_matrix/client/versions`.
diff --git a/synapse/rest/client/versions.py b/synapse/rest/client/versions.py
index 180a11ef88ae..6e5f704a3494 100644
--- a/synapse/rest/client/versions.py
+++ b/synapse/rest/client/versions.py
@@ -77,6 +77,7 @@ def on_GET(self, request: Request) -> Tuple[int, JsonDict]:
                     "v1.2",
                     "v1.3",
                     "v1.4",
+                    "v1.5",
                 ],
                 # as per MSC1497:
                 "unstable_features": {