diff --git a/keyserver/src/session/cookies.js b/keyserver/src/session/cookies.js
--- a/keyserver/src/session/cookies.js
+++ b/keyserver/src/session/cookies.js
@@ -6,7 +6,6 @@
 import bcrypt from 'twin-bcrypt';
 import url from 'url';
 
-import { hasMinCodeVersion } from 'lib/shared/version-utils.js';
 import type { Shape } from 'lib/types/core.js';
 import type { SignedIdentityKeysBlob } from 'lib/types/crypto-types.js';
 import { isWebPlatform } from 'lib/types/device-types.js';
@@ -35,7 +34,6 @@
 import { deleteCookie } from '../deleters/cookie-deleters.js';
 import { handleAsyncPromise } from '../responders/handlers.js';
 import { clearDeviceToken } from '../updaters/device-token-updaters.js';
-import { updateThreadMembers } from '../updaters/thread-updaters.js';
 import { assertSecureRequest } from '../utils/security-utils.js';
 import {
   type AppURLFacts,
@@ -862,13 +860,6 @@
   viewer: Viewer,
   platformDetails: PlatformDetails,
 ): Promise<void> {
-  if (
-    hasMinCodeVersion(platformDetails, { native: 70 }) &&
-    !hasMinCodeVersion(viewer.platformDetails, { native: 70 })
-  ) {
-    await updateThreadMembers(viewer);
-  }
-
   viewer.setPlatformDetails(platformDetails);
   const { platform, ...versions } = platformDetails;
   const versionsString =
diff --git a/keyserver/src/updaters/thread-updaters.js b/keyserver/src/updaters/thread-updaters.js
--- a/keyserver/src/updaters/thread-updaters.js
+++ b/keyserver/src/updaters/thread-updaters.js
@@ -948,27 +948,6 @@
   return response;
 }
 
-async function updateThreadMembers(viewer: Viewer) {
-  const { threadInfos } = await fetchThreadInfos(
-    viewer,
-    SQL`t.parent_thread_id IS NOT NULL `,
-  );
-
-  const updateDatas = [];
-  const time = Date.now();
-  for (const threadID in threadInfos) {
-    updateDatas.push({
-      type: updateTypes.UPDATE_THREAD,
-      userID: viewer.id,
-      time,
-      threadID: threadID,
-      targetSession: viewer.session,
-    });
-  }
-
-  await createUpdates(updateDatas);
-}
-
 async function toggleMessagePinForThread(
   viewer: Viewer,
   request: ToggleMessagePinRequest,
@@ -1058,6 +1037,5 @@
   leaveThread,
   updateThread,
   joinThread,
-  updateThreadMembers,
   toggleMessagePinForThread,
 };