diff --git a/go.mod b/go.mod
index d20089e8..7cda4fe3 100644
--- a/go.mod
+++ b/go.mod
@@ -17,7 +17,7 @@ require (
 	github.com/matrix-org/go-http-js-libp2p v0.0.0-20200318135427-31631a9ef51f
 	github.com/matrix-org/go-sqlite3-js v0.0.0-20200325174927-327088cdef10
 	github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26
-	github.com/matrix-org/gomatrixserverlib v0.0.0-20200429162354-392f0b1b7421
+	github.com/matrix-org/gomatrixserverlib v0.0.0-20200429173835-c4e77c0d7e72
 	github.com/matrix-org/naffka v0.0.0-20200422140631-181f1ee7401f
 	github.com/matrix-org/util v0.0.0-20190711121626-527ce5ddefc7
 	github.com/mattn/go-sqlite3 v2.0.2+incompatible
diff --git a/go.sum b/go.sum
index da0e02d6..5b83ed09 100644
--- a/go.sum
+++ b/go.sum
@@ -367,8 +367,8 @@ github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26 h1:Hr3zjRsq2bh
 github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26/go.mod h1:3fxX6gUjWyI/2Bt7J1OLhpCzOfO/bB3AiX0cJtEKud0=
 github.com/matrix-org/gomatrixserverlib v0.0.0-20200124100636-0c2ec91d1df5 h1:kmRjpmFOenVpOaV/DRlo9p6z/IbOKlUC+hhKsAAh8Qg=
 github.com/matrix-org/gomatrixserverlib v0.0.0-20200124100636-0c2ec91d1df5/go.mod h1:FsKa2pWE/bpQql9H7U4boOPXFoJX/QcqaZZ6ijLkaZI=
-github.com/matrix-org/gomatrixserverlib v0.0.0-20200429162354-392f0b1b7421 h1:4zP29YlpfEtJ9a7sZ33Mf0FJInD2N3/KzDcLa62bRKc=
-github.com/matrix-org/gomatrixserverlib v0.0.0-20200429162354-392f0b1b7421/go.mod h1:JsAzE1Ll3+gDWS9JSUHPJiiyAksvOOnGWF2nXdg4ZzU=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20200429173835-c4e77c0d7e72 h1:onwidlObCIqpqXpaqU2BISW4Ngq4ETer9AsbCTiR8T4=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20200429173835-c4e77c0d7e72/go.mod h1:JsAzE1Ll3+gDWS9JSUHPJiiyAksvOOnGWF2nXdg4ZzU=
 github.com/matrix-org/naffka v0.0.0-20200127221512-0716baaabaf1 h1:osLoFdOy+ChQqVUn2PeTDETFftVkl4w9t/OW18g3lnk=
 github.com/matrix-org/naffka v0.0.0-20200127221512-0716baaabaf1/go.mod h1:cXoYQIENbdWIQHt1SyCo6Bl3C3raHwJ0wgVrXHSqf+A=
 github.com/matrix-org/naffka v0.0.0-20200422140631-181f1ee7401f h1:pRz4VTiRCO4zPlEMc3ESdUOcW4PXHH4Kj+YDz1XyE+Y=
diff --git a/roomserver/version/version.go b/roomserver/version/version.go
index f2a67e74..ddd0f23a 100644
--- a/roomserver/version/version.go
+++ b/roomserver/version/version.go
@@ -51,15 +51,15 @@ var roomVersions = map[gomatrixserverlib.RoomVersion]RoomVersionDescription{
 		Stable:    true,
 	},
 	gomatrixserverlib.RoomVersionV5: RoomVersionDescription{
-		Supported: false,
-		Stable:    false,
+		Supported: true,
+		Stable:    true,
 	},
 }
 
 // DefaultRoomVersion contains the room version that will, by
 // default, be used to create new rooms on this server.
 func DefaultRoomVersion() gomatrixserverlib.RoomVersion {
-	return gomatrixserverlib.RoomVersionV4
+	return gomatrixserverlib.RoomVersionV5
 }
 
 // RoomVersions returns a map of all known room versions to this
diff --git a/sytest-whitelist b/sytest-whitelist
index 439c306c..c957021c 100644
--- a/sytest-whitelist
+++ b/sytest-whitelist
@@ -258,3 +258,9 @@ User can invite remote user to room with version 1
 User can invite remote user to room with version 2
 User can invite remote user to room with version 3
 User can invite remote user to room with version 4
+User can create and send/receive messages in a room with version 5
+local user can join room with version 5
+User can invite local user to room with version 5
+remote user can join room with version 5
+User can invite remote user to room with version 5
+Remote user can backfill in a room with version 5