diff --git a/native/redux/legacy-update-roles-and-permissions.js b/native/redux/legacy-update-roles-and-permissions.js
--- a/native/redux/legacy-update-roles-and-permissions.js
+++ b/native/redux/legacy-update-roles-and-permissions.js
@@ -10,6 +10,7 @@
 import type { ThreadPermissionsBlob } from 'lib/types/thread-permission-types.js';
 import type {
   LegacyRawThreadInfo,
+  LegacyRawThreadInfos,
   ThreadStoreThreadInfos,
   LegacyMemberInfo,
   MixedRawThreadInfos,
@@ -53,7 +54,7 @@
 // This migration utility can only be used with LegacyRawThreadInfos
 function legacyUpdateRolesAndPermissions(
   threadStoreInfos: MixedRawThreadInfos,
-): MixedRawThreadInfos {
+): LegacyRawThreadInfos {
   const updatedThreadStoreInfos = assertAllThreadInfosAreLegacy({
     ...threadStoreInfos,
   });
diff --git a/native/redux/update-roles-and-permissions.js b/native/redux/update-roles-and-permissions.js
new file mode 100644
--- /dev/null
+++ b/native/redux/update-roles-and-permissions.js
@@ -0,0 +1,48 @@
+// @flow
+
+import {
+  decodeMinimallyEncodedRawThreadInfo,
+  minimallyEncodeRawThreadInfo,
+  type RawThreadInfo,
+} from 'lib/types/minimally-encoded-thread-permissions-types.js';
+import type {
+  RawThreadInfos,
+  LegacyRawThreadInfo,
+} from 'lib/types/thread-types.js';
+
+import { legacyUpdateRolesAndPermissions } from './legacy-update-roles-and-permissions.js';
+
+function updateRolesAndPermissions(
+  threadStoreInfos: RawThreadInfos,
+): RawThreadInfos {
+  const decodedThreadStoreInfos: { [id: string]: LegacyRawThreadInfo } = {};
+
+  for (const threadID in threadStoreInfos) {
+    const rawThreadInfo = threadStoreInfos[threadID];
+
+    const decodedThreadInfo =
+      decodeMinimallyEncodedRawThreadInfo(rawThreadInfo);
+
+    decodedThreadStoreInfos[threadID] = decodedThreadInfo;
+  }
+
+  const updatedDecodedThreadStoreInfos = legacyUpdateRolesAndPermissions(
+    decodedThreadStoreInfos,
+  );
+
+  const updatedThreadStoreInfos: { [id: string]: RawThreadInfo } = {};
+
+  for (const threadID in updatedDecodedThreadStoreInfos) {
+    const updatedThreadInfo: LegacyRawThreadInfo =
+      updatedDecodedThreadStoreInfos[threadID];
+
+    const encodedUpdatedThreadInfo =
+      minimallyEncodeRawThreadInfo(updatedThreadInfo);
+
+    updatedThreadStoreInfos[threadID] = encodedUpdatedThreadInfo;
+  }
+
+  return updatedThreadStoreInfos;
+}
+
+export { updateRolesAndPermissions };