diff --git a/synapse/rest/client/versions.py b/synapse/rest/client/versions.py
index d90a6a890b..36b1c6b42a 100644
--- a/synapse/rest/client/versions.py
+++ b/synapse/rest/client/versions.py
@@ -54,7 +54,7 @@ class VersionsRestServlet(RestServlet):
                 "unstable_features": {
                     # as per MSC2190, as amended by MSC2264
                     # to be removed in r0.6.0
-                    "m.id_access_token": True,
+                    #"m.id_access_token": True,
                     # Advertise to clients that they need not include an `id_server`
                     # parameter during registration or password reset, as Synapse now decides
                     # itself which identity server to use (or none at all).
@@ -64,14 +64,14 @@ class VersionsRestServlet(RestServlet):
                     # also requires `id_server`. If the homeserver is handling 3PID
                     # verification itself, there is no need to ask the user for `id_server` to
                     # be supplied.
-                    "m.require_identity_server": False,
+                    #"m.require_identity_server": False,
                     # as per MSC2290
-                    "m.separate_add_and_bind": True,
+                    #"m.separate_add_and_bind": True,
                     # Implements support for label-based filtering as described in
                     # MSC2326.
                     "org.matrix.label_based_filtering": True,
                     # Implements support for cross signing as described in MSC1756
-                    "org.matrix.e2e_cross_signing": True,
+                    #"org.matrix.e2e_cross_signing": True,
                     # Implements additional endpoints as described in MSC2432
                     "org.matrix.msc2432": True,
                 },