diff --git a/federationapi/federationapi_test.go b/federationapi/federationapi_test.go
index bef17559a..70ad2e283 100644
--- a/federationapi/federationapi_test.go
+++ b/federationapi/federationapi_test.go
@@ -321,7 +321,7 @@ func TestRoomsV3URLEscapeDoNot404(t *testing.T) {
 	)
 
 	for _, tc := range testCases {
-		ev, err := tc.roomVer.NewEventFromTrustedJSON([]byte(tc.eventJSON), false)
+		ev, err := gomatrixserverlib.MustGetRoomVersion(tc.roomVer).NewEventFromTrustedJSON([]byte(tc.eventJSON), false)
 		if err != nil {
 			t.Errorf("failed to parse event: %s", err)
 		}
diff --git a/federationapi/internal/perform.go b/federationapi/internal/perform.go
index 2ef8b552d..c0e0ba149 100644
--- a/federationapi/internal/perform.go
+++ b/federationapi/internal/perform.go
@@ -201,8 +201,9 @@ func (r *FederationInternalAPI) performJoinUsingServer(
 	if respMakeJoin.RoomVersion == "" {
 		respMakeJoin.RoomVersion = setDefaultRoomVersionFromJoinEvent(respMakeJoin.JoinEvent)
 	}
-	if _, err = respMakeJoin.RoomVersion.EventFormat(); err != nil {
-		return fmt.Errorf("respMakeJoin.RoomVersion.EventFormat: %w", err)
+	verImpl, err := gomatrixserverlib.GetRoomVersion(respMakeJoin.RoomVersion)
+	if err != nil {
+		return err
 	}
 
 	// Build the join event.
@@ -235,7 +236,7 @@ func (r *FederationInternalAPI) performJoinUsingServer(
 	// contain signatures that we don't know about.
 	if len(respSendJoin.Event) > 0 {
 		var remoteEvent *gomatrixserverlib.Event
-		remoteEvent, err = respMakeJoin.RoomVersion.NewEventFromUntrustedJSON(respSendJoin.Event)
+		remoteEvent, err = verImpl.NewEventFromUntrustedJSON(respSendJoin.Event)
 		if err == nil && isWellFormedMembershipEvent(
 			remoteEvent, roomID, userID,
 		) {
@@ -464,8 +465,8 @@ func (r *FederationInternalAPI) performOutboundPeekUsingServer(
 	if respPeek.RoomVersion == "" {
 		respPeek.RoomVersion = gomatrixserverlib.RoomVersionV1
 	}
-	if _, err = respPeek.RoomVersion.EventFormat(); err != nil {
-		return fmt.Errorf("respPeek.RoomVersion.EventFormat: %w", err)
+	if !gomatrixserverlib.KnownRoomVersion(respPeek.RoomVersion) {
+		return fmt.Errorf("unknown room version: %s", respPeek.RoomVersion)
 	}
 
 	// we have the peek state now so let's process regardless of whether upstream gives up
@@ -552,6 +553,13 @@ func (r *FederationInternalAPI) PerformLeave(
 			continue
 		}
 
+		// Work out if we support the room version that has been supplied in
+		// the make_leave response.
+		_, err = gomatrixserverlib.GetRoomVersion(respMakeLeave.RoomVersion)
+		if err != nil {
+			return err
+		}
+
 		// Set all the fields to be what they should be, this should be a no-op
 		// but it's possible that the remote server returned us something "odd"
 		respMakeLeave.LeaveEvent.Type = spec.MRoomMember
@@ -573,12 +581,6 @@ func (r *FederationInternalAPI) PerformLeave(
 			continue
 		}
 
-		// Work out if we support the room version that has been supplied in
-		// the make_leave response.
-		if _, err = respMakeLeave.RoomVersion.EventFormat(); err != nil {
-			return gomatrixserverlib.UnsupportedRoomVersionError{}
-		}
-
 		// Build the leave event.
 		event, err := respMakeLeave.LeaveEvent.Build(
 			time.Now(),
@@ -659,8 +661,12 @@ func (r *FederationInternalAPI) PerformInvite(
 	if err != nil {
 		return fmt.Errorf("r.federation.SendInviteV2: failed to send invite: %w", err)
 	}
+	verImpl, err := gomatrixserverlib.GetRoomVersion(request.RoomVersion)
+	if err != nil {
+		return err
+	}
 
-	inviteEvent, err := request.RoomVersion.NewEventFromUntrustedJSON(inviteRes.Event)
+	inviteEvent, err := verImpl.NewEventFromUntrustedJSON(inviteRes.Event)
 	if err != nil {
 		return fmt.Errorf("r.federation.SendInviteV2 failed to decode event response: %w", err)
 	}
@@ -779,6 +785,10 @@ func federatedAuthProvider(
 	// to repeat the entire set of checks just for a missing event or two.
 	return func(roomVersion gomatrixserverlib.RoomVersion, eventIDs []string) ([]*gomatrixserverlib.Event, error) {
 		returning := []*gomatrixserverlib.Event{}
+		verImpl, err := gomatrixserverlib.GetRoomVersion(roomVersion)
+		if err != nil {
+			return nil, err
+		}
 
 		// See if we have retry entries for each of the supplied event IDs.
 		for _, eventID := range eventIDs {
@@ -808,7 +818,7 @@ func federatedAuthProvider(
 			// event ID again.
 			for _, pdu := range tx.PDUs {
 				// Try to parse the event.
-				ev, everr := roomVersion.NewEventFromUntrustedJSON(pdu)
+				ev, everr := verImpl.NewEventFromUntrustedJSON(pdu)
 				if everr != nil {
 					return nil, fmt.Errorf("missingAuth gomatrixserverlib.NewEventFromUntrustedJSON: %w", everr)
 				}
diff --git a/federationapi/queue/queue_test.go b/federationapi/queue/queue_test.go
index 77b44446b..7e71d69d7 100644
--- a/federationapi/queue/queue_test.go
+++ b/federationapi/queue/queue_test.go
@@ -105,7 +105,7 @@ func (f *stubFederationClient) P2PSendTransactionToRelay(ctx context.Context, u
 func mustCreatePDU(t *testing.T) *gomatrixserverlib.HeaderedEvent {
 	t.Helper()
 	content := `{"type":"m.room.message"}`
-	ev, err := gomatrixserverlib.RoomVersionV10.NewEventFromTrustedJSON([]byte(content), false)
+	ev, err := gomatrixserverlib.MustGetRoomVersion(gomatrixserverlib.RoomVersionV10).NewEventFromTrustedJSON([]byte(content), false)
 	if err != nil {
 		t.Fatalf("failed to create event: %v", err)
 	}
diff --git a/federationapi/routing/invite.go b/federationapi/routing/invite.go
index e9dbdb7d6..b13e59f02 100644
--- a/federationapi/routing/invite.go
+++ b/federationapi/routing/invite.go
@@ -22,7 +22,6 @@ import (
 
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
 	"github.com/matrix-org/dendrite/roomserver/api"
-	roomserverVersion "github.com/matrix-org/dendrite/roomserver/version"
 	"github.com/matrix-org/dendrite/setup/config"
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/gomatrixserverlib/fclient"
@@ -78,7 +77,7 @@ func InviteV1(
 ) util.JSONResponse {
 	roomVer := gomatrixserverlib.RoomVersionV1
 	body := request.Content()
-	event, err := roomVer.NewEventFromTrustedJSON(body, false)
+	event, err := gomatrixserverlib.MustGetRoomVersion(roomVer).NewEventFromTrustedJSON(body, false)
 	switch err.(type) {
 	case gomatrixserverlib.BadJSONError:
 		return util.JSONResponse{
@@ -116,7 +115,8 @@ func processInvite(
 ) util.JSONResponse {
 
 	// Check that we can accept invites for this room version.
-	if _, err := roomserverVersion.SupportedRoomVersion(roomVer); err != nil {
+	verImpl, err := gomatrixserverlib.GetRoomVersion(roomVer)
+	if err != nil {
 		return util.JSONResponse{
 			Code: http.StatusBadRequest,
 			JSON: jsonerror.UnsupportedRoomVersion(
@@ -157,7 +157,7 @@ func processInvite(
 	}
 
 	// Check that the event is signed by the server sending the request.
-	redacted, err := event.Version().RedactEventJSON(event.JSON())
+	redacted, err := verImpl.RedactEventJSON(event.JSON())
 	if err != nil {
 		return util.JSONResponse{
 			Code: http.StatusBadRequest,
diff --git a/federationapi/routing/join.go b/federationapi/routing/join.go
index 50a2fd1a1..0d83a2af9 100644
--- a/federationapi/routing/join.go
+++ b/federationapi/routing/join.go
@@ -206,8 +206,17 @@ func SendJoin(
 			JSON: jsonerror.InternalServerError(),
 		}
 	}
+	verImpl, err := gomatrixserverlib.GetRoomVersion(verRes.RoomVersion)
+	if err != nil {
+		return util.JSONResponse{
+			Code: http.StatusInternalServerError,
+			JSON: jsonerror.UnsupportedRoomVersion(
+				fmt.Sprintf("QueryRoomVersionForRoom returned unknown room version: %s", verRes.RoomVersion),
+			),
+		}
+	}
 
-	event, err := verRes.RoomVersion.NewEventFromUntrustedJSON(request.Content())
+	event, err := verImpl.NewEventFromUntrustedJSON(request.Content())
 	if err != nil {
 		return util.JSONResponse{
 			Code: http.StatusBadRequest,
@@ -287,7 +296,7 @@ func SendJoin(
 	}
 
 	// Check that the event is signed by the server sending the request.
-	redacted, err := event.Version().RedactEventJSON(event.JSON())
+	redacted, err := verImpl.RedactEventJSON(event.JSON())
 	if err != nil {
 		logrus.WithError(err).Errorf("XXX: join.go")
 		return util.JSONResponse{
@@ -461,9 +470,11 @@ func checkRestrictedJoin(
 	roomVersion gomatrixserverlib.RoomVersion,
 	roomID, userID string,
 ) (*util.JSONResponse, string, error) {
-	if allowRestricted, err := roomVersion.MayAllowRestrictedJoinsInEventAuth(); err != nil {
+	verImpl, err := gomatrixserverlib.GetRoomVersion(roomVersion)
+	if err != nil {
 		return nil, "", err
-	} else if !allowRestricted {
+	}
+	if !verImpl.MayAllowRestrictedJoinsInEventAuth() {
 		return nil, "", nil
 	}
 	req := &api.QueryRestrictedJoinAllowedRequest{
diff --git a/federationapi/routing/leave.go b/federationapi/routing/leave.go
index b003c1cd8..d189cc538 100644
--- a/federationapi/routing/leave.go
+++ b/federationapi/routing/leave.go
@@ -149,8 +149,18 @@ func SendLeave(
 		}
 	}
 
+	verImpl, err := gomatrixserverlib.GetRoomVersion(verRes.RoomVersion)
+	if err != nil {
+		return util.JSONResponse{
+			Code: http.StatusInternalServerError,
+			JSON: jsonerror.UnsupportedRoomVersion(
+				fmt.Sprintf("QueryRoomVersionForRoom returned unknown version: %s", verRes.RoomVersion),
+			),
+		}
+	}
+
 	// Decode the event JSON from the request.
-	event, err := verRes.RoomVersion.NewEventFromUntrustedJSON(request.Content())
+	event, err := verImpl.NewEventFromUntrustedJSON(request.Content())
 	switch err.(type) {
 	case gomatrixserverlib.BadJSONError:
 		return util.JSONResponse{
@@ -253,7 +263,7 @@ func SendLeave(
 	}
 
 	// Check that the event is signed by the server sending the request.
-	redacted, err := event.Version().RedactEventJSON(event.JSON())
+	redacted, err := verImpl.RedactEventJSON(event.JSON())
 	if err != nil {
 		logrus.WithError(err).Errorf("XXX: leave.go")
 		return util.JSONResponse{
diff --git a/federationapi/routing/threepid.go b/federationapi/routing/threepid.go
index 831f3c61a..31f29fd3f 100644
--- a/federationapi/routing/threepid.go
+++ b/federationapi/routing/threepid.go
@@ -196,7 +196,12 @@ func ExchangeThirdPartyInvite(
 		util.GetLogger(httpReq.Context()).WithError(err).Error("federation.SendInvite failed")
 		return jsonerror.InternalServerError()
 	}
-	inviteEvent, err := verRes.RoomVersion.NewEventFromUntrustedJSON(signedEvent.Event)
+	verImpl, err := gomatrixserverlib.GetRoomVersion(verRes.RoomVersion)
+	if err != nil {
+		util.GetLogger(httpReq.Context()).WithError(err).Errorf("unknown room version: %s", verRes.RoomVersion)
+		return jsonerror.InternalServerError()
+	}
+	inviteEvent, err := verImpl.NewEventFromUntrustedJSON(signedEvent.Event)
 	if err != nil {
 		util.GetLogger(httpReq.Context()).WithError(err).Error("federation.SendInvite failed")
 		return jsonerror.InternalServerError()
diff --git a/go.mod b/go.mod
index 034a0976b..bff99dc14 100644
--- a/go.mod
+++ b/go.mod
@@ -22,7 +22,7 @@ require (
 	github.com/matrix-org/dugong v0.0.0-20210921133753-66e6b1c67e2e
 	github.com/matrix-org/go-sqlite3-js v0.0.0-20220419092513-28aa791a1c91
 	github.com/matrix-org/gomatrix v0.0.0-20220926102614-ceba4d9f7530
-	github.com/matrix-org/gomatrixserverlib v0.0.0-20230420172450-7ea8ead4a832
+	github.com/matrix-org/gomatrixserverlib v0.0.0-20230421153744-40a91492619e
 	github.com/matrix-org/pinecone v0.11.1-0.20230210171230-8c3b24f2649a
 	github.com/matrix-org/util v0.0.0-20221111132719-399730281e66
 	github.com/mattn/go-sqlite3 v1.14.16
diff --git a/go.sum b/go.sum
index 35659355b..70995a93f 100644
--- a/go.sum
+++ b/go.sum
@@ -337,6 +337,12 @@ github.com/matrix-org/gomatrixserverlib v0.0.0-20230420165305-c51ffd14d28d h1:pS
 github.com/matrix-org/gomatrixserverlib v0.0.0-20230420165305-c51ffd14d28d/go.mod h1:7HTbSZe+CIdmeqVyFMekwD5dFU8khWQyngKATvd12FU=
 github.com/matrix-org/gomatrixserverlib v0.0.0-20230420172450-7ea8ead4a832 h1:xEUPCS8+BEJ9+JEazxkQS1+YnWyFAsHoIMp5ijA7NAY=
 github.com/matrix-org/gomatrixserverlib v0.0.0-20230420172450-7ea8ead4a832/go.mod h1:7HTbSZe+CIdmeqVyFMekwD5dFU8khWQyngKATvd12FU=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20230421103805-98f1fbf26443 h1:UxYdP/B+wN67pOWpvzlNeASMn9K1reF/bPHFo1wpqXQ=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20230421103805-98f1fbf26443/go.mod h1:7HTbSZe+CIdmeqVyFMekwD5dFU8khWQyngKATvd12FU=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20230421152946-4e6e880889e3 h1:+svc0Md8R2SYlcJu45NR+/JO1aYzMrMAi7rGLS1UfsM=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20230421152946-4e6e880889e3/go.mod h1:7HTbSZe+CIdmeqVyFMekwD5dFU8khWQyngKATvd12FU=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20230421153744-40a91492619e h1:lGhoTgpiLYPkVIAHOW/7itugzkLWs81tNlpHI6bhT5I=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20230421153744-40a91492619e/go.mod h1:7HTbSZe+CIdmeqVyFMekwD5dFU8khWQyngKATvd12FU=
 github.com/matrix-org/pinecone v0.11.1-0.20230210171230-8c3b24f2649a h1:awrPDf9LEFySxTLKYBMCiObelNx/cBuv/wzllvCCH3A=
 github.com/matrix-org/pinecone v0.11.1-0.20230210171230-8c3b24f2649a/go.mod h1:HchJX9oKMXaT2xYFs0Ha/6Zs06mxLU8k6F1ODnrGkeQ=
 github.com/matrix-org/util v0.0.0-20221111132719-399730281e66 h1:6z4KxomXSIGWqhHcfzExgkH3Z3UkIXry4ibJS4Aqz2Y=
diff --git a/internal/eventutil/events.go b/internal/eventutil/events.go
index c7dee3464..283c91d89 100644
--- a/internal/eventutil/events.go
+++ b/internal/eventutil/events.go
@@ -112,10 +112,11 @@ func addPrevEventsToEvent(
 		return ErrRoomNoExists
 	}
 
-	eventFormat, err := queryRes.RoomVersion.EventFormat()
+	verImpl, err := gomatrixserverlib.GetRoomVersion(queryRes.RoomVersion)
 	if err != nil {
-		return fmt.Errorf("queryRes.RoomVersion.EventFormat: %w", err)
+		return fmt.Errorf("GetRoomVersion: %w", err)
 	}
+	eventFormat := verImpl.EventFormat()
 
 	builder.Depth = queryRes.Depth
 
diff --git a/internal/pushrules/evaluate_test.go b/internal/pushrules/evaluate_test.go
index d2f6cecc2..4fa17b294 100644
--- a/internal/pushrules/evaluate_test.go
+++ b/internal/pushrules/evaluate_test.go
@@ -189,7 +189,7 @@ func TestPatternMatches(t *testing.T) {
 }
 
 func mustEventFromJSON(t *testing.T, json string) *gomatrixserverlib.Event {
-	ev, err := gomatrixserverlib.RoomVersionV7.NewEventFromTrustedJSON([]byte(json), false)
+	ev, err := gomatrixserverlib.MustGetRoomVersion(gomatrixserverlib.RoomVersionV7).NewEventFromTrustedJSON([]byte(json), false)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/internal/transactionrequest.go b/internal/transactionrequest.go
index a7c192e3c..bb16cefe6 100644
--- a/internal/transactionrequest.go
+++ b/internal/transactionrequest.go
@@ -137,7 +137,11 @@ func (t *TxnReq) ProcessTransaction(ctx context.Context) (*fclient.RespSend, *ut
 			continue
 		}
 		roomVersion := getRoomVersion(header.RoomID)
-		event, err := roomVersion.NewEventFromUntrustedJSON(pdu)
+		verImpl, err := gomatrixserverlib.GetRoomVersion(roomVersion)
+		if err != nil {
+			continue
+		}
+		event, err := verImpl.NewEventFromUntrustedJSON(pdu)
 		if err != nil {
 			if _, ok := err.(gomatrixserverlib.BadJSONError); ok {
 				// Room version 6 states that homeservers should strictly enforce canonical JSON
diff --git a/internal/transactionrequest_test.go b/internal/transactionrequest_test.go
index e178e0a4e..6b4c6129c 100644
--- a/internal/transactionrequest_test.go
+++ b/internal/transactionrequest_test.go
@@ -633,7 +633,7 @@ func TestProcessTransactionRequestEDUUnhandled(t *testing.T) {
 
 func init() {
 	for _, j := range testData {
-		e, err := testRoomVersion.NewEventFromTrustedJSON(j, false)
+		e, err := gomatrixserverlib.MustGetRoomVersion(testRoomVersion).NewEventFromTrustedJSON(j, false)
 		if err != nil {
 			panic("cannot load test data: " + err.Error())
 		}
diff --git a/roomserver/internal/helpers/helpers.go b/roomserver/internal/helpers/helpers.go
index 6834ec82a..b90f5fe54 100644
--- a/roomserver/internal/helpers/helpers.go
+++ b/roomserver/internal/helpers/helpers.go
@@ -149,7 +149,12 @@ func IsInvitePending(
 		return false, "", "", nil, fmt.Errorf("missing user for NID %d (%+v)", senderUserNIDs[0], senderUsers)
 	}
 
-	event, err := info.RoomVersion.NewEventFromTrustedJSON(eventJSON, false)
+	verImpl, err := gomatrixserverlib.GetRoomVersion(info.RoomVersion)
+	if err != nil {
+		return false, "", "", nil, err
+	}
+
+	event, err := verImpl.NewEventFromTrustedJSON(eventJSON, false)
 
 	return true, senderUser, userNIDToEventID[senderUserNIDs[0]], event, err
 }
diff --git a/roomserver/internal/input/input_missing.go b/roomserver/internal/input/input_missing.go
index 61dd05bf1..1aeb67c93 100644
--- a/roomserver/internal/input/input_missing.go
+++ b/roomserver/internal/input/input_missing.go
@@ -838,6 +838,11 @@ func (t *missingStateReq) lookupEvent(ctx context.Context, roomVersion gomatrixs
 	trace, ctx := internal.StartRegion(ctx, "lookupEvent")
 	defer trace.EndRegion()
 
+	verImpl, err := gomatrixserverlib.GetRoomVersion(roomVersion)
+	if err != nil {
+		return nil, err
+	}
+
 	if localFirst {
 		// fetch from the roomserver
 		events, err := t.db.EventsFromIDs(ctx, t.roomInfo, []string{missingEventID})
@@ -865,7 +870,7 @@ func (t *missingStateReq) lookupEvent(ctx context.Context, roomVersion gomatrixs
 			}
 			continue
 		}
-		event, err = roomVersion.NewEventFromUntrustedJSON(txn.PDUs[0])
+		event, err = verImpl.NewEventFromUntrustedJSON(txn.PDUs[0])
 		if err != nil {
 			t.log.WithError(err).WithField("missing_event_id", missingEventID).Warnf("Failed to parse event JSON of event returned from /event")
 			continue
diff --git a/roomserver/internal/input/input_test.go b/roomserver/internal/input/input_test.go
index e7bc4471e..493848d95 100644
--- a/roomserver/internal/input/input_test.go
+++ b/roomserver/internal/input/input_test.go
@@ -35,7 +35,7 @@ func TestSingleTransactionOnInput(t *testing.T) {
 		ctx, cancel := context.WithDeadline(processCtx.Context(), deadline)
 		defer cancel()
 
-		event, err := gomatrixserverlib.RoomVersionV6.NewEventFromTrustedJSON(
+		event, err := gomatrixserverlib.MustGetRoomVersion(gomatrixserverlib.RoomVersionV6).NewEventFromTrustedJSON(
 			[]byte(`{"auth_events":[],"content":{"creator":"@neilalexander:dendrite.matrix.org","room_version":"6"},"depth":1,"hashes":{"sha256":"jqOqdNEH5r0NiN3xJtj0u5XUVmRqq9YvGbki1wxxuuM"},"origin":"dendrite.matrix.org","origin_server_ts":1644595362726,"prev_events":[],"prev_state":[],"room_id":"!jSZZRknA6GkTBXNP:dendrite.matrix.org","sender":"@neilalexander:dendrite.matrix.org","signatures":{"dendrite.matrix.org":{"ed25519:6jB2aB":"bsQXO1wketf1OSe9xlndDIWe71W9KIundc6rBw4KEZdGPW7x4Tv4zDWWvbxDsG64sS2IPWfIm+J0OOozbrWIDw"}},"state_key":"","type":"m.room.create"}`),
 			false,
 		)
diff --git a/roomserver/internal/query/query.go b/roomserver/internal/query/query.go
index 2c85d3ebb..8a5a99663 100644
--- a/roomserver/internal/query/query.go
+++ b/roomserver/internal/query/query.go
@@ -884,12 +884,14 @@ func (r *Queryer) QueryRestrictedJoinAllowed(ctx context.Context, req *api.Query
 	if roomInfo == nil || roomInfo.IsStub() {
 		return nil // fmt.Errorf("room %q doesn't exist or is stub room", req.RoomID)
 	}
+	verImpl, err := gomatrixserverlib.GetRoomVersion(roomInfo.RoomVersion)
+	if err != nil {
+		return err
+	}
 	// If the room version doesn't allow restricted joins then don't
 	// try to process any further.
-	allowRestrictedJoins, err := roomInfo.RoomVersion.MayAllowRestrictedJoinsInEventAuth()
-	if err != nil {
-		return fmt.Errorf("roomInfo.RoomVersion.AllowRestrictedJoinsInEventAuth: %w", err)
-	} else if !allowRestrictedJoins {
+	allowRestrictedJoins := verImpl.MayAllowRestrictedJoinsInEventAuth()
+	if !allowRestrictedJoins {
 		return nil
 	}
 	// Start off by populating the "resident" flag in the response. If we
diff --git a/roomserver/internal/query/query_test.go b/roomserver/internal/query/query_test.go
index 907f7625f..0df9eedae 100644
--- a/roomserver/internal/query/query_test.go
+++ b/roomserver/internal/query/query_test.go
@@ -54,7 +54,7 @@ func (db *getEventDB) addFakeEvent(eventID string, authIDs []string) error {
 		return err
 	}
 
-	event, err := gomatrixserverlib.RoomVersionV1.NewEventFromTrustedJSON(
+	event, err := gomatrixserverlib.MustGetRoomVersion(gomatrixserverlib.RoomVersionV1).NewEventFromTrustedJSON(
 		eventJSON, false,
 	)
 	if err != nil {
diff --git a/roomserver/state/state.go b/roomserver/state/state.go
index c3842784e..d20877b48 100644
--- a/roomserver/state/state.go
+++ b/roomserver/state/state.go
@@ -878,10 +878,12 @@ func (v *StateResolution) resolveConflicts(
 	trace, ctx := internal.StartRegion(ctx, "StateResolution.resolveConflicts")
 	defer trace.EndRegion()
 
-	stateResAlgo, err := version.StateResAlgorithm()
+	verImpl, err := gomatrixserverlib.GetRoomVersion(version)
 	if err != nil {
 		return nil, err
 	}
+
+	stateResAlgo := verImpl.StateResAlgorithm()
 	switch stateResAlgo {
 	case gomatrixserverlib.StateResV1:
 		return v.resolveConflictsV1(ctx, notConflicted, conflicted)
diff --git a/roomserver/storage/postgres/state_snapshot_table.go b/roomserver/storage/postgres/state_snapshot_table.go
index c1efdad39..db6644154 100644
--- a/roomserver/storage/postgres/state_snapshot_table.go
+++ b/roomserver/storage/postgres/state_snapshot_table.go
@@ -218,6 +218,10 @@ func (s *stateSnapshotStatements) BulkSelectMembershipForHistoryVisibility(
 	var membershipEventID string
 
 	knownEvents := make(map[string]*gomatrixserverlib.HeaderedEvent, len(eventIDs))
+	verImpl, err := gomatrixserverlib.GetRoomVersion(roomInfo.RoomVersion)
+	if err != nil {
+		return nil, err
+	}
 
 	for rows.Next() {
 		if err = rows.Scan(&eventID, &membershipEventID, &evJson); err != nil {
@@ -232,7 +236,7 @@ func (s *stateSnapshotStatements) BulkSelectMembershipForHistoryVisibility(
 			result[eventID] = ev
 			continue
 		}
-		event, err := roomInfo.RoomVersion.NewEventFromTrustedJSON(evJson, false)
+		event, err := verImpl.NewEventFromTrustedJSON(evJson, false)
 		if err != nil {
 			result[eventID] = &gomatrixserverlib.HeaderedEvent{}
 			// not fatal
diff --git a/roomserver/storage/shared/storage.go b/roomserver/storage/shared/storage.go
index c9eb0ca07..8db116440 100644
--- a/roomserver/storage/shared/storage.go
+++ b/roomserver/storage/shared/storage.go
@@ -579,9 +579,14 @@ func (d *EventDatabase) events(
 		eventIDs = map[types.EventNID]string{}
 	}
 
+	verImpl, err := gomatrixserverlib.GetRoomVersion(roomInfo.RoomVersion)
+	if err != nil {
+		return nil, err
+	}
+
 	for _, eventJSON := range eventJSONs {
 		redacted := gjson.GetBytes(eventJSON.EventJSON, "unsigned.redacted_because").Exists()
-		events[eventJSON.EventNID], err = roomInfo.RoomVersion.NewEventFromTrustedJSONWithEventID(
+		events[eventJSON.EventNID], err = verImpl.NewEventFromTrustedJSONWithEventID(
 			eventIDs[eventJSON.EventNID], eventJSON.EventJSON, redacted,
 		)
 		if err != nil {
@@ -1125,13 +1130,17 @@ func (d *Database) GetHistoryVisibilityState(ctx context.Context, roomInfo *type
 	if err != nil {
 		eventIDs = map[types.EventNID]string{}
 	}
+	verImpl, err := gomatrixserverlib.GetRoomVersion(roomInfo.RoomVersion)
+	if err != nil {
+		return nil, err
+	}
 	events := make([]*gomatrixserverlib.Event, 0, len(eventNIDs))
 	for _, eventNID := range eventNIDs {
 		data, err := d.EventJSONTable.BulkSelectEventJSON(ctx, nil, []types.EventNID{eventNID})
 		if err != nil {
 			return nil, err
 		}
-		ev, err := roomInfo.RoomVersion.NewEventFromTrustedJSONWithEventID(eventIDs[eventNID], data[0].EventJSON, false)
+		ev, err := verImpl.NewEventFromTrustedJSONWithEventID(eventIDs[eventNID], data[0].EventJSON, false)
 		if err != nil {
 			return nil, err
 		}
@@ -1181,6 +1190,10 @@ func (d *Database) GetStateEvent(ctx context.Context, roomID, evType, stateKey s
 			eventNIDs = append(eventNIDs, e.EventNID)
 		}
 	}
+	verImpl, err := gomatrixserverlib.GetRoomVersion(roomInfo.RoomVersion)
+	if err != nil {
+		return nil, err
+	}
 	eventIDs, _ := d.EventsTable.BulkSelectEventID(ctx, nil, eventNIDs)
 	if err != nil {
 		eventIDs = map[types.EventNID]string{}
@@ -1195,7 +1208,7 @@ func (d *Database) GetStateEvent(ctx context.Context, roomID, evType, stateKey s
 			if len(data) == 0 {
 				return nil, fmt.Errorf("GetStateEvent: no json for event nid %d", e.EventNID)
 			}
-			ev, err := roomInfo.RoomVersion.NewEventFromTrustedJSONWithEventID(eventIDs[e.EventNID], data[0].EventJSON, false)
+			ev, err := verImpl.NewEventFromTrustedJSONWithEventID(eventIDs[e.EventNID], data[0].EventJSON, false)
 			if err != nil {
 				return nil, err
 			}
@@ -1250,9 +1263,13 @@ func (d *Database) GetStateEventsWithEventType(ctx context.Context, roomID, evTy
 	if len(eventPairs) == 0 {
 		return nil, nil
 	}
+	verImpl, err := gomatrixserverlib.GetRoomVersion(roomInfo.RoomVersion)
+	if err != nil {
+		return nil, err
+	}
 	var result []*gomatrixserverlib.HeaderedEvent
 	for _, pair := range eventPairs {
-		ev, err := roomInfo.RoomVersion.NewEventFromTrustedJSONWithEventID(eventIDs[pair.EventNID], pair.EventJSON, false)
+		ev, err := verImpl.NewEventFromTrustedJSONWithEventID(eventIDs[pair.EventNID], pair.EventJSON, false)
 		if err != nil {
 			return nil, err
 		}
@@ -1372,7 +1389,11 @@ func (d *Database) GetBulkStateContent(ctx context.Context, roomIDs []string, tu
 	result := make([]tables.StrippedEvent, len(events))
 	for i := range events {
 		roomVer := eventNIDToVer[events[i].EventNID]
-		ev, err := roomVer.NewEventFromTrustedJSONWithEventID(eventIDs[events[i].EventNID], events[i].EventJSON, false)
+		verImpl, err := gomatrixserverlib.GetRoomVersion(roomVer)
+		if err != nil {
+			return nil, err
+		}
+		ev, err := verImpl.NewEventFromTrustedJSONWithEventID(eventIDs[events[i].EventNID], events[i].EventJSON, false)
 		if err != nil {
 			return nil, fmt.Errorf("GetBulkStateContent: failed to load event JSON for event NID %v : %w", events[i].EventNID, err)
 		}
diff --git a/roomserver/version/version.go b/roomserver/version/version.go
index c40d8e0f7..7ede3c989 100644
--- a/roomserver/version/version.go
+++ b/roomserver/version/version.go
@@ -28,39 +28,32 @@ func DefaultRoomVersion() gomatrixserverlib.RoomVersion {
 
 // RoomVersions returns a map of all known room versions to this
 // server.
-func RoomVersions() map[gomatrixserverlib.RoomVersion]gomatrixserverlib.RoomVersionDescription {
+func RoomVersions() map[gomatrixserverlib.RoomVersion]gomatrixserverlib.RoomVersionImpl {
 	return gomatrixserverlib.RoomVersions()
 }
 
 // SupportedRoomVersions returns a map of descriptions for room
 // versions that are supported by this homeserver.
-func SupportedRoomVersions() map[gomatrixserverlib.RoomVersion]gomatrixserverlib.RoomVersionDescription {
-	return gomatrixserverlib.SupportedRoomVersions()
+func SupportedRoomVersions() map[gomatrixserverlib.RoomVersion]gomatrixserverlib.RoomVersionImpl {
+	return gomatrixserverlib.RoomVersions()
 }
 
 // RoomVersion returns information about a specific room version.
 // An UnknownVersionError is returned if the version is not known
 // to the server.
-func RoomVersion(version gomatrixserverlib.RoomVersion) (gomatrixserverlib.RoomVersionDescription, error) {
+func RoomVersion(version gomatrixserverlib.RoomVersion) (gomatrixserverlib.RoomVersionImpl, error) {
 	if version, ok := gomatrixserverlib.RoomVersions()[version]; ok {
 		return version, nil
 	}
-	return gomatrixserverlib.RoomVersionDescription{}, UnknownVersionError{version}
+	return gomatrixserverlib.RoomVersionImpl{}, UnknownVersionError{version}
 }
 
 // SupportedRoomVersion returns information about a specific room
 // version. An UnknownVersionError is returned if the version is not
 // known to the server, or an UnsupportedVersionError is returned if
 // the version is known but specifically marked as unsupported.
-func SupportedRoomVersion(version gomatrixserverlib.RoomVersion) (gomatrixserverlib.RoomVersionDescription, error) {
-	result, err := RoomVersion(version)
-	if err != nil {
-		return gomatrixserverlib.RoomVersionDescription{}, err
-	}
-	if !result.Supported {
-		return gomatrixserverlib.RoomVersionDescription{}, UnsupportedVersionError{version}
-	}
-	return result, nil
+func SupportedRoomVersion(version gomatrixserverlib.RoomVersion) (gomatrixserverlib.RoomVersionImpl, error) {
+	return RoomVersion(version)
 }
 
 // UnknownVersionError is caused when the room version is not known.
diff --git a/syncapi/synctypes/clientevent_test.go b/syncapi/synctypes/clientevent_test.go
index 7fd33de9a..b914e64f1 100644
--- a/syncapi/synctypes/clientevent_test.go
+++ b/syncapi/synctypes/clientevent_test.go
@@ -24,7 +24,7 @@ import (
 )
 
 func TestToClientEvent(t *testing.T) { // nolint: gocyclo
-	ev, err := gomatrixserverlib.RoomVersionV1.NewEventFromTrustedJSON([]byte(`{
+	ev, err := gomatrixserverlib.MustGetRoomVersion(gomatrixserverlib.RoomVersionV1).NewEventFromTrustedJSON([]byte(`{
 		"type": "m.room.name",
 		"state_key": "",
 		"event_id": "$test:localhost",
@@ -79,7 +79,7 @@ func TestToClientEvent(t *testing.T) { // nolint: gocyclo
 }
 
 func TestToClientFormatSync(t *testing.T) {
-	ev, err := gomatrixserverlib.RoomVersionV1.NewEventFromTrustedJSON([]byte(`{
+	ev, err := gomatrixserverlib.MustGetRoomVersion(gomatrixserverlib.RoomVersionV1).NewEventFromTrustedJSON([]byte(`{
 		"type": "m.room.name",
 		"state_key": "",
 		"event_id": "$test:localhost",
diff --git a/syncapi/types/types_test.go b/syncapi/types/types_test.go
index e06a66b71..a864c6f4d 100644
--- a/syncapi/types/types_test.go
+++ b/syncapi/types/types_test.go
@@ -50,7 +50,7 @@ func TestNewInviteResponse(t *testing.T) {
 	event := `{"auth_events":["$SbSsh09j26UAXnjd3RZqf2lyA3Kw2sY_VZJVZQAV9yA","$EwL53onrLwQ5gL8Dv3VrOOCvHiueXu2ovLdzqkNi3lo","$l2wGmz9iAwevBDGpHT_xXLUA5O8BhORxWIGU1cGi1ZM","$GsWFJLXgdlF5HpZeyWkP72tzXYWW3uQ9X28HBuTztHE"],"content":{"avatar_url":"","displayname":"neilalexander","membership":"invite"},"depth":9,"hashes":{"sha256":"8p+Ur4f8vLFX6mkIXhxI0kegPG7X3tWy56QmvBkExAg"},"origin":"matrix.org","origin_server_ts":1602087113066,"prev_events":["$1v-O6tNwhOZcA8bvCYY-Dnj1V2ZDE58lLPxtlV97S28"],"prev_state":[],"room_id":"!XbeXirGWSPXbEaGokF:matrix.org","sender":"@neilalexander:matrix.org","signatures":{"dendrite.neilalexander.dev":{"ed25519:BMJi":"05KQ5lPw0cSFsE4A0x1z7vi/3cc8bG4WHUsFWYkhxvk/XkXMGIYAYkpNThIvSeLfdcHlbm/k10AsBSKH8Uq4DA"},"matrix.org":{"ed25519:a_RXGa":"jeovuHr9E/x0sHbFkdfxDDYV/EyoeLi98douZYqZ02iYddtKhfB7R3WLay/a+D3V3V7IW0FUmPh/A404x5sYCw"}},"state_key":"@neilalexander:dendrite.neilalexander.dev","type":"m.room.member","unsigned":{"age":2512,"invite_room_state":[{"content":{"join_rule":"invite"},"sender":"@neilalexander:matrix.org","state_key":"","type":"m.room.join_rules"},{"content":{"avatar_url":"mxc://matrix.org/BpDaozLwgLnlNStxDxvLzhPr","displayname":"neilalexander","membership":"join"},"sender":"@neilalexander:matrix.org","state_key":"@neilalexander:matrix.org","type":"m.room.member"},{"content":{"name":"Test room"},"sender":"@neilalexander:matrix.org","state_key":"","type":"m.room.name"}]},"_room_version":"5"}`
 	expected := `{"invite_state":{"events":[{"content":{"join_rule":"invite"},"sender":"@neilalexander:matrix.org","state_key":"","type":"m.room.join_rules"},{"content":{"avatar_url":"mxc://matrix.org/BpDaozLwgLnlNStxDxvLzhPr","displayname":"neilalexander","membership":"join"},"sender":"@neilalexander:matrix.org","state_key":"@neilalexander:matrix.org","type":"m.room.member"},{"content":{"name":"Test room"},"sender":"@neilalexander:matrix.org","state_key":"","type":"m.room.name"},{"content":{"avatar_url":"","displayname":"neilalexander","membership":"invite"},"event_id":"$GQmw8e8-26CQv1QuFoHBHpKF1hQj61Flg3kvv_v_XWs","origin_server_ts":1602087113066,"sender":"@neilalexander:matrix.org","state_key":"@neilalexander:dendrite.neilalexander.dev","type":"m.room.member"}]}}`
 
-	ev, err := gomatrixserverlib.RoomVersionV5.NewEventFromTrustedJSON([]byte(event), false)
+	ev, err := gomatrixserverlib.MustGetRoomVersion(gomatrixserverlib.RoomVersionV5).NewEventFromTrustedJSON([]byte(event), false)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/userapi/consumers/roomserver_test.go b/userapi/consumers/roomserver_test.go
index 2ece0d580..465ec21aa 100644
--- a/userapi/consumers/roomserver_test.go
+++ b/userapi/consumers/roomserver_test.go
@@ -36,7 +36,7 @@ func mustCreateDatabase(t *testing.T, dbType test.DBType) (storage.UserDatabase,
 
 func mustCreateEvent(t *testing.T, content string) *gomatrixserverlib.HeaderedEvent {
 	t.Helper()
-	ev, err := gomatrixserverlib.RoomVersionV10.NewEventFromTrustedJSON([]byte(content), false)
+	ev, err := gomatrixserverlib.MustGetRoomVersion(gomatrixserverlib.RoomVersionV10).NewEventFromTrustedJSON([]byte(content), false)
 	if err != nil {
 		t.Fatalf("failed to create event: %v", err)
 	}