1 files changed, 2 insertions, 2 deletions
diff --git a/synapse/rest/client/capabilities.py b/synapse/rest/client/capabilities.py
index 65b3b5ce2c..d6b6256413 100644
--- a/synapse/rest/client/capabilities.py
+++ b/synapse/rest/client/capabilities.py
@@ -44,10 +44,10 @@ class CapabilitiesRestServlet(RestServlet):
         await self.auth.get_user_by_req(request, allow_guest=True)
         change_password = self.auth_handler.can_change_password()
 
-        response = {
+        response: JsonDict = {
             "capabilities": {
                 "m.room_versions": {
-                    "default": self.config.default_room_version.identifier,
+                    "default": self.config.server.default_room_version.identifier,
                     "available": {
                         v.identifier: v.disposition
                         for v in KNOWN_ROOM_VERSIONS.values()