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-rw-r--r--synapse/rest/client/v2_alpha/room_upgrade_rest_servlet.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/synapse/rest/client/v2_alpha/room_upgrade_rest_servlet.py b/synapse/rest/client/v2_alpha/room_upgrade_rest_servlet.py
index ca97330797..f357015a70 100644
--- a/synapse/rest/client/v2_alpha/room_upgrade_rest_servlet.py
+++ b/synapse/rest/client/v2_alpha/room_upgrade_rest_servlet.py
@@ -64,7 +64,8 @@ class RoomUpgradeRestServlet(RestServlet):
         assert_params_in_dict(content, ("new_version",))
         new_version = content["new_version"]
 
-        if new_version not in KNOWN_ROOM_VERSIONS:
+        new_version = KNOWN_ROOM_VERSIONS.get(content["new_version"])
+        if new_version is None:
             raise SynapseError(
                 400,
                 "Your homeserver does not support this room version",