diff --git a/changelog.d/16707.feature b/changelog.d/16707.feature
new file mode 100644
index 0000000000..707502d344
--- /dev/null
+++ b/changelog.d/16707.feature
@@ -0,0 +1 @@
+Synapse now declares support for Matrix v1.7, v1.8, and v1.9.
diff --git a/synapse/rest/client/versions.py b/synapse/rest/client/versions.py
index 95400ba570..f4d19e0470 100644
--- a/synapse/rest/client/versions.py
+++ b/synapse/rest/client/versions.py
@@ -80,6 +80,9 @@ class VersionsRestServlet(RestServlet):
                     "v1.4",
                     "v1.5",
                     "v1.6",
+                    "v1.7",
+                    "v1.8",
+                    "v1.9",
                 ],
                 # as per MSC1497:
                 "unstable_features": {