diff --git a/src/room/GroupCallView.tsx b/src/room/GroupCallView.tsx
index 49d8b60b..a9c31150 100644
--- a/src/room/GroupCallView.tsx
+++ b/src/room/GroupCallView.tsx
@@ -70,10 +70,7 @@ import {
   UnknownCallError,
 } from "../utils/errors.ts";
 import { GroupCallErrorBoundary } from "./GroupCallErrorBoundary.tsx";
-import {
-  useNewMembershipManager as useNewMembershipManagerSetting,
-  useSetting,
-} from "../settings/settings";
+import { useSetting } from "../settings/settings";
 import { useTypedEventEmitter } from "../useEvents";
 import { muteAllAudio$ } from "../state/MuteAllAudioModel.ts";
 import { useAppBarTitle } from "../AppBar.tsx";
@@ -186,7 +183,6 @@ export const GroupCallView: FC<Props> = ({
     password: passwordFromUrl,
   } = useUrlParams();
   const e2eeSystem = useRoomEncryptionSystem(room.roomId);
-  const [useNewMembershipManager] = useSetting(useNewMembershipManagerSetting);
 
   // Save the password once we start the groupCallView
   useEffect(() => {
@@ -310,7 +306,6 @@ export const GroupCallView: FC<Props> = ({
     mediaDevices,
     latestMuteStates,
     setJoined,
-    useNewMembershipManager,
   ]);
 
   // TODO refactor this + "joined" to just one callState
diff --git a/src/rtcSessionHelpers.test.ts b/src/rtcSessionHelpers.test.ts
index 258d2f9a..b2caaf89 100644
--- a/src/rtcSessionHelpers.test.ts
+++ b/src/rtcSessionHelpers.test.ts
@@ -126,7 +126,6 @@ test("It joins the correct Session", async () => {
     {
       manageMediaKeys: false,
       useLegacyMemberEvents: false,
-      useNewMembershipManager: true,
       useExperimentalToDeviceTransport: false,
     },
   );
diff --git a/src/rtcSessionHelpers.ts b/src/rtcSessionHelpers.ts
index f8bdb03b..3dd7c5f8 100644
--- a/src/rtcSessionHelpers.ts
+++ b/src/rtcSessionHelpers.ts
@@ -101,7 +101,6 @@ export async function enterRTCSession(
   rtcSession: MatrixRTCSession,
   transport: LivekitTransport,
   encryptMedia: boolean,
-  useNewMembershipManager = true,
   useExperimentalToDeviceTransport = false,
   useMultiSfu = true,
 ): Promise<void> {
@@ -123,7 +122,6 @@ export async function enterRTCSession(
     {
       notificationType,
       callIntent,
-      useNewMembershipManager,
       manageMediaKeys: encryptMedia,
       ...(useDeviceSessionMemberEvents !== undefined && {
         useLegacyMemberEvents: !useDeviceSessionMemberEvents,
@@ -139,7 +137,7 @@ export async function enterRTCSession(
       membershipEventExpiryMs:
         matrixRtcSessionConfig?.membership_event_expiry_ms,
       useExperimentalToDeviceTransport,
-      useStickyEvents: true,
+      unstableSendStickyEvents: true,
     },
   );
   if (widget) {
diff --git a/src/settings/DeveloperSettingsTab.tsx b/src/settings/DeveloperSettingsTab.tsx
index 36c8a2e6..c24eadc5 100644
--- a/src/settings/DeveloperSettingsTab.tsx
+++ b/src/settings/DeveloperSettingsTab.tsx
@@ -14,7 +14,6 @@ import {
   duplicateTiles as duplicateTilesSetting,
   debugTileLayout as debugTileLayoutSetting,
   showConnectionStats as showConnectionStatsSetting,
-  useNewMembershipManager as useNewMembershipManagerSetting,
   useExperimentalToDeviceTransport as useExperimentalToDeviceTransportSetting,
   multiSfu as multiSfuSetting,
   muteAllAudio as muteAllAudioSetting,
@@ -40,10 +39,6 @@ export const DeveloperSettingsTab: FC<Props> = ({ client, livekitRooms }) => {
     showConnectionStatsSetting,
   );
 
-  const [useNewMembershipManager, setNewMembershipManager] = useSetting(
-    useNewMembershipManagerSetting,
-  );
-
   const [alwaysShowIphoneEarpiece, setAlwaysShowIphoneEarpiece] = useSetting(
     alwaysShowIphoneEarpieceSetting,
   );
@@ -140,20 +135,6 @@ export const DeveloperSettingsTab: FC<Props> = ({ client, livekitRooms }) => {
           )}
         />
       </FieldRow>
-      <FieldRow>
-        <InputField
-          id="useNewMembershipManager"
-          type="checkbox"
-          label={t("developer_mode.use_new_membership_manager")}
-          checked={!!useNewMembershipManager}
-          onChange={useCallback(
-            (event: ChangeEvent<HTMLInputElement>): void => {
-              setNewMembershipManager(event.target.checked);
-            },
-            [setNewMembershipManager],
-          )}
-        />
-      </FieldRow>
       <FieldRow>
         <InputField
           id="useToDeviceKeyTransport"
diff --git a/src/settings/settings.ts b/src/settings/settings.ts
index ef09162a..59b7a473 100644
--- a/src/settings/settings.ts
+++ b/src/settings/settings.ts
@@ -115,11 +115,6 @@ export const soundEffectVolume = new Setting<number>(
   0.5,
 );
 
-export const useNewMembershipManager = new Setting<boolean>(
-  "new-membership-manager",
-  true,
-);
-
 export const useExperimentalToDeviceTransport = new Setting<boolean>(
   "experimental-to-device-transport",
   true,