diff --git a/changelog.d/4128.misc b/changelog.d/4128.misc
new file mode 100644
index 000000000..76ab4b085
--- /dev/null
+++ b/changelog.d/4128.misc
@@ -0,0 +1 @@
+Add STATE_V2_TEST room version
diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index 5565e516d..e63b1e8a3 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -102,6 +102,7 @@ class ThirdPartyEntityKind(object):
 class RoomVersions(object):
     V1 = "1"
     VDH_TEST = "vdh-test-version"
+    STATE_V2_TEST = "state-v2-test"
 
 
 # the version we will give rooms which are created on this server
@@ -109,7 +110,11 @@ DEFAULT_ROOM_VERSION = RoomVersions.V1
 
 # vdh-test-version is a placeholder to get room versioning support working and tested
 # until we have a working v2.
-KNOWN_ROOM_VERSIONS = {RoomVersions.V1, RoomVersions.VDH_TEST}
+KNOWN_ROOM_VERSIONS = {
+    RoomVersions.V1,
+    RoomVersions.VDH_TEST,
+    RoomVersions.STATE_V2_TEST,
+}
 
 ServerNoticeMsgType = "m.server_notice"
 ServerNoticeLimitReached = "m.server_notice.usage_limit_reached"
diff --git a/synapse/state/__init__.py b/synapse/state/__init__.py
index 9b40b18d5..943d5d6bb 100644
--- a/synapse/state/__init__.py
+++ b/synapse/state/__init__.py
@@ -607,7 +607,7 @@ def resolve_events_with_store(room_version, state_sets, event_map, state_res_sto
         return v1.resolve_events_with_store(
             state_sets, event_map, state_res_store.get_events,
         )
-    elif room_version == RoomVersions.VDH_TEST:
+    elif room_version in (RoomVersions.VDH_TEST, RoomVersions.STATE_V2_TEST):
         return v2.resolve_events_with_store(
             state_sets, event_map, state_res_store,
         )