diff --git a/go.mod b/go.mod
index 68ffb45c..ea994dd7 100644
--- a/go.mod
+++ b/go.mod
@@ -21,7 +21,7 @@ require (
 	github.com/matrix-org/go-http-js-libp2p v0.0.0-20200518170932-783164aeeda4
 	github.com/matrix-org/go-sqlite3-js v0.0.0-20200522092705-bc8506ccbcf3
 	github.com/matrix-org/gomatrix v0.0.0-20200827122206-7dd5e2a05bcd
-	github.com/matrix-org/gomatrixserverlib v0.0.0-20210216163908-bab1f2be20d0
+	github.com/matrix-org/gomatrixserverlib v0.0.0-20210302161955-6142fe3f8c2c
 	github.com/matrix-org/naffka v0.0.0-20200901083833-bcdd62999a91
 	github.com/matrix-org/util v0.0.0-20200807132607-55161520e1d4
 	github.com/mattn/go-sqlite3 v1.14.2
diff --git a/go.sum b/go.sum
index cd9bf86e..667a23ca 100644
--- a/go.sum
+++ b/go.sum
@@ -601,8 +601,8 @@ 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/gomatrix v0.0.0-20200827122206-7dd5e2a05bcd h1:xVrqJK3xHREMNjwjljkAUaadalWc0rRbmVuQatzmgwg=
 github.com/matrix-org/gomatrix v0.0.0-20200827122206-7dd5e2a05bcd/go.mod h1:/gBX06Kw0exX1HrwmoBibFA98yBk/jxKpGVeyQbff+s=
-github.com/matrix-org/gomatrixserverlib v0.0.0-20210216163908-bab1f2be20d0 h1:eP8t7DaLKkNz0IT9GcJeG6UTKjfvihIxbAXKN0I7j6g=
-github.com/matrix-org/gomatrixserverlib v0.0.0-20210216163908-bab1f2be20d0/go.mod h1:JsAzE1Ll3+gDWS9JSUHPJiiyAksvOOnGWF2nXdg4ZzU=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20210302161955-6142fe3f8c2c h1:vW3jBp1PnZ4uUqyS+JatJRYIl73ZLHkUkRzf1JdGxOI=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20210302161955-6142fe3f8c2c/go.mod h1:JsAzE1Ll3+gDWS9JSUHPJiiyAksvOOnGWF2nXdg4ZzU=
 github.com/matrix-org/naffka v0.0.0-20200901083833-bcdd62999a91 h1:HJ6U3S3ljJqNffYMcIeAncp5qT/i+ZMiJ2JC2F0aXP4=
 github.com/matrix-org/naffka v0.0.0-20200901083833-bcdd62999a91/go.mod h1:sjyPyRxKM5uw1nD2cJ6O2OxI6GOqyVBfNXqKjBZTBZE=
 github.com/matrix-org/util v0.0.0-20190711121626-527ce5ddefc7 h1:ntrLa/8xVzeSs8vHFHK25k0C+NV74sYMJnNSg5NoSRo=
diff --git a/setup/mscs/msc2946/msc2946.go b/setup/mscs/msc2946/msc2946.go
index 03af0666..a125fd78 100644
--- a/setup/mscs/msc2946/msc2946.go
+++ b/setup/mscs/msc2946/msc2946.go
@@ -70,11 +70,11 @@ func Enable(
 		}
 	})
 
-	base.PublicClientAPIMux.Handle("/unstable/rooms/{roomID}/spaces",
+	base.PublicClientAPIMux.Handle("/unstable/org.matrix.msc2946/rooms/{roomID}/spaces",
 		httputil.MakeAuthAPI("spaces", userAPI, spacesHandler(db, rsAPI, fsAPI, base.Cfg.Global.ServerName)),
 	).Methods(http.MethodPost, http.MethodOptions)
 
-	base.PublicFederationAPIMux.Handle("/unstable/spaces/{roomID}", httputil.MakeExternalAPI(
+	base.PublicFederationAPIMux.Handle("/unstable/org.matrix.msc2946/spaces/{roomID}", httputil.MakeExternalAPI(
 		"msc2946_fed_spaces", func(req *http.Request) util.JSONResponse {
 			fedReq, errResp := gomatrixserverlib.VerifyHTTPRequest(
 				req, time.Now(), base.Cfg.Global.ServerName, keyRing,
diff --git a/setup/mscs/msc2946/msc2946_test.go b/setup/mscs/msc2946/msc2946_test.go
index 4f180a98..99085c0f 100644
--- a/setup/mscs/msc2946/msc2946_test.go
+++ b/setup/mscs/msc2946/msc2946_test.go
@@ -309,7 +309,7 @@ func postSpaces(t *testing.T, expectCode int, accessToken, roomID string, req *g
 		t.Fatalf("failed to marshal request: %s", err)
 	}
 	httpReq, err := http.NewRequest(
-		"POST", "http://localhost:8010/_matrix/client/unstable/rooms/"+url.PathEscape(roomID)+"/spaces",
+		"POST", "http://localhost:8010/_matrix/client/unstable/org.matrix.msc2946/rooms/"+url.PathEscape(roomID)+"/spaces",
 		bytes.NewBuffer(data),
 	)
 	httpReq.Header.Set("Authorization", "Bearer "+accessToken)