diff --git a/lib/shared/messages/update-relationship-message-spec.js b/lib/shared/messages/update-relationship-message-spec.js
--- a/lib/shared/messages/update-relationship-message-spec.js
+++ b/lib/shared/messages/update-relationship-message-spec.js
@@ -9,6 +9,7 @@
   pushTypes,
 } from './message-spec.js';
 import { assertSingleMessageInfo } from './utils.js';
+import type { PlatformDetails } from '../../types/device-types.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
@@ -20,6 +21,7 @@
   type LegacyUpdateRelationshipMessageData,
   type LegacyUpdateRelationshipMessageInfo,
 } from '../../types/messages/legacy-update-relationship.js';
+import type { RawUnsupportedMessageInfo } from '../../types/messages/unsupported.js';
 import type {
   RawUpdateRelationshipMessageInfo,
   UpdateRelationshipMessageData,
@@ -30,6 +32,7 @@
 import type { NotifTexts } from '../../types/notif-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import { type EntityText, ET } from '../../utils/entity-text.js';
+import { FUTURE_CODE_VERSION, hasMinCodeVersion } from '../version-utils.js';
 
 type UpdateRelationshipMessageSpec = MessageSpec<
   LegacyUpdateRelationshipMessageData | UpdateRelationshipMessageData,
@@ -199,6 +202,48 @@
       );
     },
 
+    shimUnsupportedMessageInfo(
+      rawMessageInfo:
+        | RawUpdateRelationshipMessageInfo
+        | RawLegacyUpdateRelationshipMessageInfo,
+      platformDetails: ?PlatformDetails,
+    ):
+      | RawLegacyUpdateRelationshipMessageInfo
+      | RawUpdateRelationshipMessageInfo
+      | RawUnsupportedMessageInfo {
+      if (rawMessageInfo.type === messageTypes.LEGACY_UPDATE_RELATIONSHIP) {
+        return rawMessageInfo;
+      } else if (
+        rawMessageInfo.type === messageTypes.UPDATE_RELATIONSHIP &&
+        hasMinCodeVersion(platformDetails, {
+          native: FUTURE_CODE_VERSION,
+          web: FUTURE_CODE_VERSION,
+          majorDesktop: FUTURE_CODE_VERSION,
+        })
+      ) {
+        return rawMessageInfo;
+      } else if (
+        rawMessageInfo.type === messageTypes.UPDATE_RELATIONSHIP &&
+        rawMessageInfo.operation !== 'farcaster_mutual'
+      ) {
+        return {
+          ...rawMessageInfo,
+          type: messageTypes.LEGACY_UPDATE_RELATIONSHIP,
+          operation: rawMessageInfo.operation,
+        };
+      } else {
+        return {
+          type: messageTypes.UNSUPPORTED,
+          id: rawMessageInfo.id,
+          threadID: rawMessageInfo.threadID,
+          creatorID: rawMessageInfo.creatorID,
+          time: rawMessageInfo.time,
+          robotext: 'Your connection on Farcaster is on Comm.',
+          unsupportedMessageInfo: rawMessageInfo,
+        };
+      }
+    },
+
     unshimMessageInfo(
       unwrapped:
         | RawLegacyUpdateRelationshipMessageInfo