diff --git a/lib/actions/user-actions.js b/lib/actions/user-actions.js
--- a/lib/actions/user-actions.js
+++ b/lib/actions/user-actions.js
@@ -32,6 +32,7 @@
 } from '../shared/crypto-utils.js';
 import { fetchLatestDeviceList } from '../shared/device-list-utils.js';
 import { useProcessAndSendDMOperation } from '../shared/dm-ops/process-dm-ops.js';
+import { useUpdateFarcasterSubscription } from '../shared/farcaster/farcaster-api.js';
 import type { AuthMetadata } from '../shared/identity-client-context';
 import { IdentityClientContext } from '../shared/identity-client-context.js';
 import threadWatcher from '../shared/thread-watcher.js';
@@ -1384,6 +1385,7 @@
     state => state.currentUserInfo && state.currentUserInfo.id,
   );
   const keyserverCall = useKeyserverCall(updateSubscription);
+  const updateFarcasterSubscription = useUpdateFarcasterSubscription();
 
   return React.useCallback(
     async (input: UseUpdateSubscriptionInput) =>
@@ -1392,9 +1394,15 @@
         {
           processAndSendDMOperation,
           keyserverUpdateSubscription: keyserverCall,
+          updateFarcasterSubscription,
         },
       ),
-    [keyserverCall, processAndSendDMOperation, viewerID],
+    [
+      keyserverCall,
+      processAndSendDMOperation,
+      updateFarcasterSubscription,
+      viewerID,
+    ],
   );
 }
 
diff --git a/lib/shared/farcaster/farcaster-api.js b/lib/shared/farcaster/farcaster-api.js
--- a/lib/shared/farcaster/farcaster-api.js
+++ b/lib/shared/farcaster/farcaster-api.js
@@ -285,10 +285,33 @@
   );
 }
 
+export type UpdateFarcasterSubscriptionInput = {
+  +conversationId: string,
+  +muted: boolean,
+};
+
+function useUpdateFarcasterSubscription(): (
+  input: UpdateFarcasterSubscriptionInput,
+) => Promise<void> {
+  const { sendFarcasterRequest } = useTunnelbroker();
+  return React.useCallback(
+    async (input: UpdateFarcasterSubscriptionInput) => {
+      await sendFarcasterRequest({
+        apiVersion: 'v2',
+        endpoint: 'direct-cast-conversation-notifications',
+        method: { type: 'POST' },
+        payload: JSON.stringify(input),
+      });
+    },
+    [sendFarcasterRequest],
+  );
+}
+
 export {
   useSendFarcasterTextMessage,
   useFetchFarcasterMessages,
   useFetchFarcasterConversation,
   useFetchFarcasterInbox,
   useUpdateFarcasterGroupNameAndDescription,
+  useUpdateFarcasterSubscription,
 };
diff --git a/lib/shared/threads/protocols/farcaster-thread-protocol.js b/lib/shared/threads/protocols/farcaster-thread-protocol.js
--- a/lib/shared/threads/protocols/farcaster-thread-protocol.js
+++ b/lib/shared/threads/protocols/farcaster-thread-protocol.js
@@ -45,8 +45,10 @@
   ChangeThreadSettingsUtils,
   ProtocolChangeThreadSettingsInput,
   ProtocolSendTextMessageInput,
+  ProtocolUpdateSubscriptionInput,
   SendTextMessageUtils,
   ThreadProtocol,
+  UpdateSubscriptionUtils,
 } from '../thread-spec.js';
 
 const farcasterThreadProtocol: ThreadProtocol<MemberInfoSansPermissions> = {
@@ -210,8 +212,32 @@
     throw new Error('addThreadMembers method is not yet implemented');
   },
 
-  updateSubscription: async (): Promise<SubscriptionUpdateResult> => {
-    throw new Error('updateSubscription method is not yet implemented');
+  updateSubscription: async (
+    protocolInput: ProtocolUpdateSubscriptionInput,
+    utils: UpdateSubscriptionUtils,
+  ): Promise<SubscriptionUpdateResult> => {
+    const { input } = protocolInput;
+    const { threadInfo, updatedFields } = input;
+    const { home, pushNotifs } = updatedFields;
+    const { updateFarcasterSubscription } = utils;
+
+    invariant(
+      home === pushNotifs,
+      'background notifs are not supported for Farcaster',
+    );
+
+    const muted = !home && !pushNotifs;
+    const conversationId = conversationIDFromFarcasterThreadID(threadInfo.id);
+
+    await updateFarcasterSubscription({ conversationId, muted });
+
+    return {
+      threadID: threadInfo.id,
+      subscription: {
+        ...threadInfo.currentUser.subscription,
+        ...updatedFields,
+      },
+    };
   },
 
   leaveThread: async () => {
diff --git a/lib/shared/threads/thread-spec.js b/lib/shared/threads/thread-spec.js
--- a/lib/shared/threads/thread-spec.js
+++ b/lib/shared/threads/thread-spec.js
@@ -92,6 +92,7 @@
   FetchFarcasterConversationInput,
   FetchFarcasterMessageInput,
   FetchFarcasterMessageResult,
+  UpdateFarcasterSubscriptionInput,
 } from '../farcaster/farcaster-api.js';
 import type { FetchThickMessagesType } from '../message-utils.js';
 import type {
@@ -233,6 +234,7 @@
 export type UpdateSubscriptionUtils = {
   +processAndSendDMOperation: OutboundDMOperationSpecification => Promise<void>,
   +keyserverUpdateSubscription: SubscriptionUpdateRequest => Promise<SubscriptionUpdateResult>,
+  +updateFarcasterSubscription: UpdateFarcasterSubscriptionInput => Promise<void>,
 };
 
 export type ProtocolLeaveThreadInput = {