diff --git a/eduserver/api/input.go b/eduserver/api/input.go
index 2fa253f4d..2aab107b2 100644
--- a/eduserver/api/input.go
+++ b/eduserver/api/input.go
@@ -100,10 +100,4 @@ type EDUServerInputAPI interface {
 		request *InputReceiptEventRequest,
 		response *InputReceiptEventResponse,
 	) error
-
-	InputCrossSigningKeyUpdate(
-		ctx context.Context,
-		request *InputCrossSigningKeyUpdateRequest,
-		response *InputCrossSigningKeyUpdateResponse,
-	) error
 }
diff --git a/eduserver/eduserver.go b/eduserver/eduserver.go
index febcf2864..9b7e21651 100644
--- a/eduserver/eduserver.go
+++ b/eduserver/eduserver.go
@@ -51,7 +51,6 @@ func NewInternalAPI(
 		OutputTypingEventTopic:       cfg.Matrix.JetStream.TopicFor(jetstream.OutputTypingEvent),
 		OutputSendToDeviceEventTopic: cfg.Matrix.JetStream.TopicFor(jetstream.OutputSendToDeviceEvent),
 		OutputReceiptEventTopic:      cfg.Matrix.JetStream.TopicFor(jetstream.OutputReceiptEvent),
-		OutputKeyChangeEventTopic:    cfg.Matrix.JetStream.TopicFor(jetstream.OutputKeyChangeEvent),
 		ServerName:                   cfg.Matrix.ServerName,
 	}
 }
diff --git a/eduserver/input/input.go b/eduserver/input/input.go
index 4f8ab3e34..e58f0dd34 100644
--- a/eduserver/input/input.go
+++ b/eduserver/input/input.go
@@ -23,7 +23,6 @@ import (
 
 	"github.com/matrix-org/dendrite/eduserver/api"
 	"github.com/matrix-org/dendrite/eduserver/cache"
-	keyapi "github.com/matrix-org/dendrite/keyserver/api"
 	userapi "github.com/matrix-org/dendrite/userapi/api"
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/nats-io/nats.go"
@@ -40,8 +39,6 @@ type EDUServerInputAPI struct {
 	OutputSendToDeviceEventTopic string
 	// The kafka topic to output new receipt events to
 	OutputReceiptEventTopic string
-	// The kafka topic to output new key change events to
-	OutputKeyChangeEventTopic string
 	// kafka producer
 	JetStream nats.JetStreamContext
 	// Internal user query API
@@ -80,34 +77,6 @@ func (t *EDUServerInputAPI) InputSendToDeviceEvent(
 	return t.sendToDeviceEvent(ise)
 }
 
-// InputCrossSigningKeyUpdate implements api.EDUServerInputAPI
-func (t *EDUServerInputAPI) InputCrossSigningKeyUpdate(
-	ctx context.Context,
-	request *api.InputCrossSigningKeyUpdateRequest,
-	response *api.InputCrossSigningKeyUpdateResponse,
-) error {
-	eventJSON, err := json.Marshal(&keyapi.DeviceMessage{
-		Type: keyapi.TypeCrossSigningUpdate,
-		OutputCrossSigningKeyUpdate: &api.OutputCrossSigningKeyUpdate{
-			CrossSigningKeyUpdate: request.CrossSigningKeyUpdate,
-		},
-	})
-	if err != nil {
-		return err
-	}
-
-	logrus.WithFields(logrus.Fields{
-		"user_id": request.UserID,
-	}).Tracef("Producing to topic '%s'", t.OutputKeyChangeEventTopic)
-
-	_, err = t.JetStream.PublishMsg(&nats.Msg{
-		Subject: t.OutputKeyChangeEventTopic,
-		Header:  nats.Header{},
-		Data:    eventJSON,
-	})
-	return err
-}
-
 func (t *EDUServerInputAPI) sendTypingEvent(ite *api.InputTypingEvent) error {
 	ev := &api.TypingEvent{
 		Type:   gomatrixserverlib.MTyping,
diff --git a/eduserver/inthttp/client.go b/eduserver/inthttp/client.go
index 9a6f483c2..0690ed827 100644
--- a/eduserver/inthttp/client.go
+++ b/eduserver/inthttp/client.go
@@ -12,10 +12,9 @@ import (
 
 // HTTP paths for the internal HTTP APIs
 const (
-	EDUServerInputTypingEventPath           = "/eduserver/input"
-	EDUServerInputSendToDeviceEventPath     = "/eduserver/sendToDevice"
-	EDUServerInputReceiptEventPath          = "/eduserver/receipt"
-	EDUServerInputCrossSigningKeyUpdatePath = "/eduserver/crossSigningKeyUpdate"
+	EDUServerInputTypingEventPath       = "/eduserver/input"
+	EDUServerInputSendToDeviceEventPath = "/eduserver/sendToDevice"
+	EDUServerInputReceiptEventPath      = "/eduserver/receipt"
 )
 
 // NewEDUServerClient creates a EDUServerInputAPI implemented by talking to a HTTP POST API.
@@ -69,16 +68,3 @@ func (h *httpEDUServerInputAPI) InputReceiptEvent(
 	apiURL := h.eduServerURL + EDUServerInputReceiptEventPath
 	return httputil.PostJSON(ctx, span, h.httpClient, apiURL, request, response)
 }
-
-// InputCrossSigningKeyUpdate implements EDUServerInputAPI
-func (h *httpEDUServerInputAPI) InputCrossSigningKeyUpdate(
-	ctx context.Context,
-	request *api.InputCrossSigningKeyUpdateRequest,
-	response *api.InputCrossSigningKeyUpdateResponse,
-) error {
-	span, ctx := opentracing.StartSpanFromContext(ctx, "InputCrossSigningKeyUpdate")
-	defer span.Finish()
-
-	apiURL := h.eduServerURL + EDUServerInputCrossSigningKeyUpdatePath
-	return httputil.PostJSON(ctx, span, h.httpClient, apiURL, request, response)
-}
diff --git a/eduserver/inthttp/server.go b/eduserver/inthttp/server.go
index a50ca84f9..a34943750 100644
--- a/eduserver/inthttp/server.go
+++ b/eduserver/inthttp/server.go
@@ -51,17 +51,4 @@ func AddRoutes(t api.EDUServerInputAPI, internalAPIMux *mux.Router) {
 			return util.JSONResponse{Code: http.StatusOK, JSON: &response}
 		}),
 	)
-	internalAPIMux.Handle(EDUServerInputCrossSigningKeyUpdatePath,
-		httputil.MakeInternalAPI("inputCrossSigningKeyUpdate", func(req *http.Request) util.JSONResponse {
-			var request api.InputCrossSigningKeyUpdateRequest
-			var response api.InputCrossSigningKeyUpdateResponse
-			if err := json.NewDecoder(req.Body).Decode(&request); err != nil {
-				return util.MessageResponse(http.StatusBadRequest, err.Error())
-			}
-			if err := t.InputCrossSigningKeyUpdate(req.Context(), &request, &response); err != nil {
-				return util.ErrorResponse(err)
-			}
-			return util.JSONResponse{Code: http.StatusOK, JSON: &response}
-		}),
-	)
 }