diff --git a/synapse/replication/tcp/client.py b/synapse/replication/tcp/client.py
index 1b2412405ca5..93d53d68db0e 100644
--- a/synapse/replication/tcp/client.py
+++ b/synapse/replication/tcp/client.py
@@ -423,7 +423,7 @@ async def _on_new_receipts(
                 receipt.receipt_type,
                 receipt.user_id,
                 [receipt.event_id],
-                thread_id=None,  # TODO
+                thread_id=receipt.thread_id,
                 data=receipt.data,
             )
             await self.federation_sender.send_read_receipt(receipt_info)
diff --git a/synapse/replication/tcp/streams/_base.py b/synapse/replication/tcp/streams/_base.py
index 398bebeaa659..e01155ad597b 100644
--- a/synapse/replication/tcp/streams/_base.py
+++ b/synapse/replication/tcp/streams/_base.py
@@ -361,6 +361,7 @@ class ReceiptsStreamRow:
         receipt_type: str
         user_id: str
         event_id: str
+        thread_id: Optional[str]
         data: dict
 
     NAME = "receipts"
diff --git a/synapse/storage/databases/main/receipts.py b/synapse/storage/databases/main/receipts.py
index def2e2d21c40..a20f9feb59da 100644
--- a/synapse/storage/databases/main/receipts.py
+++ b/synapse/storage/databases/main/receipts.py
@@ -526,7 +526,7 @@ def _get_users_sent_receipts_between_txn(txn: LoggingTransaction) -> List[str]:
 
     async def get_all_updated_receipts(
         self, instance_name: str, last_id: int, current_id: int, limit: int
-    ) -> Tuple[List[Tuple[int, list]], int, bool]:
+    ) -> Tuple[List[Tuple[int, Tuple[str, str, str, str, str, JsonDict]]], int, bool]:
         """Get updates for receipts replication stream.
 
         Args:
@@ -553,9 +553,9 @@ async def get_all_updated_receipts(
 
         def get_all_updated_receipts_txn(
             txn: LoggingTransaction,
-        ) -> Tuple[List[Tuple[int, list]], int, bool]:
+        ) -> Tuple[List[Tuple[int, Tuple[str, str, str, str, str, JsonDict]]], int, bool]:
             sql = """
-                SELECT stream_id, room_id, receipt_type, user_id, event_id, data
+                SELECT stream_id, room_id, receipt_type, user_id, event_id, thread_id, data
                 FROM receipts_linearized
                 WHERE ? < stream_id AND stream_id <= ?
                 ORDER BY stream_id ASC
@@ -564,8 +564,8 @@ def get_all_updated_receipts_txn(
             txn.execute(sql, (last_id, current_id, limit))
 
             updates = cast(
-                List[Tuple[int, list]],
-                [(r[0], r[1:5] + (db_to_json(r[5]),)) for r in txn],
+                List[Tuple[int, Tuple[str, str, str, str, str, JsonDict]]],
+                [(r[0], r[1:6] + (db_to_json(r[6]),)) for r in txn],
             )
 
             limited = False