diff --git a/federationapi/federationapi.go b/federationapi/federationapi.go
index ff01b1952..4a13c9d9b 100644
--- a/federationapi/federationapi.go
+++ b/federationapi/federationapi.go
@@ -18,6 +18,8 @@ import (
 	"time"
 
 	"github.com/gorilla/mux"
+	"github.com/sirupsen/logrus"
+
 	"github.com/matrix-org/dendrite/federationapi/api"
 	federationAPI "github.com/matrix-org/dendrite/federationapi/api"
 	"github.com/matrix-org/dendrite/federationapi/consumers"
@@ -33,10 +35,10 @@ import (
 	"github.com/matrix-org/dendrite/setup/base"
 	"github.com/matrix-org/dendrite/setup/jetstream"
 	userapi "github.com/matrix-org/dendrite/userapi/api"
-	"github.com/sirupsen/logrus"
+
+	"github.com/matrix-org/gomatrixserverlib"
 
 	"github.com/matrix-org/dendrite/federationapi/routing"
-	"github.com/matrix-org/gomatrixserverlib"
 )
 
 // AddInternalRoutes registers HTTP handlers for the internal API. Invokes functions
@@ -66,6 +68,7 @@ func AddPublicRoutes(
 		TopicTypingEvent:       cfg.Matrix.JetStream.Prefixed(jetstream.OutputTypingEvent),
 		TopicPresenceEvent:     cfg.Matrix.JetStream.Prefixed(jetstream.OutputPresenceEvent),
 		TopicDeviceListUpdate:  cfg.Matrix.JetStream.Prefixed(jetstream.InputDeviceListUpdate),
+		TopicSigningKeyUpdate:  cfg.Matrix.JetStream.Prefixed(jetstream.InputSigningKeyUpdate),
 		ServerName:             cfg.Matrix.ServerName,
 		UserAPI:                userAPI,
 	}
diff --git a/federationapi/producers/syncapi.go b/federationapi/producers/syncapi.go
index 43dd08dd8..0825bccbb 100644
--- a/federationapi/producers/syncapi.go
+++ b/federationapi/producers/syncapi.go
@@ -21,12 +21,13 @@ import (
 	"strconv"
 	"time"
 
-	"github.com/matrix-org/dendrite/setup/jetstream"
-	"github.com/matrix-org/dendrite/syncapi/types"
-	userapi "github.com/matrix-org/dendrite/userapi/api"
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/nats-io/nats.go"
 	log "github.com/sirupsen/logrus"
+
+	"github.com/matrix-org/dendrite/setup/jetstream"
+	"github.com/matrix-org/dendrite/syncapi/types"
+	userapi "github.com/matrix-org/dendrite/userapi/api"
 )
 
 // SyncAPIProducer produces events for the sync API server to consume
@@ -36,6 +37,7 @@ type SyncAPIProducer struct {
 	TopicTypingEvent       string
 	TopicPresenceEvent     string
 	TopicDeviceListUpdate  string
+	TopicSigningKeyUpdate  string
 	JetStream              nats.JetStreamContext
 	ServerName             gomatrixserverlib.ServerName
 	UserAPI                userapi.UserInternalAPI
@@ -178,3 +180,15 @@ func (p *SyncAPIProducer) SendDeviceListUpdate(
 	_, err = p.JetStream.PublishMsg(m, nats.Context(ctx))
 	return err
 }
+
+func (p *SyncAPIProducer) SendSigningKeyUpdate(
+	ctx context.Context, data gomatrixserverlib.RawJSON, origin gomatrixserverlib.ServerName,
+) (err error) {
+	m := nats.NewMsg(p.TopicSigningKeyUpdate)
+	m.Header.Set("origin", string(origin))
+	m.Data = data
+
+	log.Debugf("Sending signing key update")
+	_, err = p.JetStream.PublishMsg(m, nats.Context(ctx))
+	return err
+}
diff --git a/federationapi/routing/send.go b/federationapi/routing/send.go
index 87b6fa33e..3d9319964 100644
--- a/federationapi/routing/send.go
+++ b/federationapi/routing/send.go
@@ -22,6 +22,11 @@ import (
 	"sync"
 	"time"
 
+	"github.com/matrix-org/gomatrixserverlib"
+	"github.com/matrix-org/util"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/sirupsen/logrus"
+
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
 	federationAPI "github.com/matrix-org/dendrite/federationapi/api"
 	"github.com/matrix-org/dendrite/federationapi/producers"
@@ -31,10 +36,6 @@ import (
 	"github.com/matrix-org/dendrite/roomserver/api"
 	"github.com/matrix-org/dendrite/setup/config"
 	syncTypes "github.com/matrix-org/dendrite/syncapi/types"
-	"github.com/matrix-org/gomatrixserverlib"
-	"github.com/matrix-org/util"
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/sirupsen/logrus"
 )
 
 const (
@@ -391,7 +392,7 @@ func (t *txnReq) processEDUs(ctx context.Context) {
 				}
 			}
 		case types.MSigningKeyUpdate:
-			if err := t.processSigningKeyUpdate(ctx, e); err != nil {
+			if err := t.producer.SendSigningKeyUpdate(ctx, e.Content, t.Origin); err != nil {
 				logrus.WithError(err).Errorf("Failed to process signing key update")
 			}
 		case gomatrixserverlib.MPresence:
@@ -431,42 +432,6 @@ func (t *txnReq) processPresence(ctx context.Context, e gomatrixserverlib.EDU) e
 	return nil
 }
 
-func (t *txnReq) processSigningKeyUpdate(ctx context.Context, e gomatrixserverlib.EDU) error {
-	var updatePayload keyapi.CrossSigningKeyUpdate
-	if err := json.Unmarshal(e.Content, &updatePayload); err != nil {
-		util.GetLogger(ctx).WithError(err).WithFields(logrus.Fields{
-			"user_id": updatePayload.UserID,
-		}).Debug("Failed to unmarshal signing key update")
-		return err
-	}
-	if _, serverName, err := gomatrixserverlib.SplitID('@', updatePayload.UserID); err != nil {
-		return nil
-	} else if serverName == t.ourServerName {
-		return nil
-	} else if serverName != t.Origin {
-		return nil
-	}
-	keys := gomatrixserverlib.CrossSigningKeys{}
-	if updatePayload.MasterKey != nil {
-		keys.MasterKey = *updatePayload.MasterKey
-	}
-	if updatePayload.SelfSigningKey != nil {
-		keys.SelfSigningKey = *updatePayload.SelfSigningKey
-	}
-	uploadReq := &keyapi.PerformUploadDeviceKeysRequest{
-		CrossSigningKeys: keys,
-		UserID:           updatePayload.UserID,
-	}
-	uploadRes := &keyapi.PerformUploadDeviceKeysResponse{}
-	if err := t.keyAPI.PerformUploadDeviceKeys(ctx, uploadReq, uploadRes); err != nil {
-		return err
-	}
-	if uploadRes.Error != nil {
-		return uploadRes.Error
-	}
-	return nil
-}
-
 // processReceiptEvent sends receipt events to JetStream
 func (t *txnReq) processReceiptEvent(ctx context.Context,
 	userID, roomID, receiptType string,